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GuardmasterElf - Miniature tongue operated safety interlock switch  Guardmaster "Elf" Safety Interlock Switch The Elf is a tongue (or key) operated safety interlock switch designed to fit at the leading edge of sliding, hinged or lift-off guards. The Elf’s unique miniature housing (only 75 x 25 x 29mm) makes it the smallest tongue interlock currently available. It is designed for smaller machines such as printers, copiers or domestic machinery which, until now, have been unable to use safety interlocks due to space restrictions. With its dual entry slots and rotatable head, the versatile Elf can offer up to eight different actuator entry options. Based on the Cadet design, the Elf contains all of the same safety related features in a more compact housing. Operation of the switch is achieved through the insertion of a specially profiled stainless steel key that is permanently mounted to the guard door. This semi-flexible key allows the Elf to be used on small radii doors (150mm). The Elf is available with either 2 N/C safety contacts or 1 N/C safety and 1 N/O auxiliary contacts. The conduit entry is 1 x M16 or 1 x Pg9 and sealed to IP 67. Optional quick disconnect versions are also available and maintain IP 67 sealing. A blanking plug is supplied for the unused key entry.  Guardmaster Cadet 3 Safety Interlock switch The Cadet 3 is a tongue (or key) operated safety interlock switch designed to fit at the leading edge of sliding, hinged or lift-off guards. With its dual entry slots and rotatable head, the versatile Cadet 3 can offer up to eight different actuator entry options. The Cadet 3 has a body size of 90.5 x 31 x 30.4mm and has industry standard DIN 50047 fixing centres for ease of retrofitting. Operation of the switch is achieved through the insertion of a specially profiled stainless steel key that is permanently mounted to the guard door. This semi-flexible key allows the Cadet 3 to be used on small radii doors (150mm). Available with a variety of contact configurations, the Cadet is sealed to IP67 and has three conduit entries, M16 or Pg9. A blanking plug is supplied for the unused key entry.  Guardmaster Trojan 5&6 safety interlock switches The Trojan 5 and 6 are universal tongue (or key) actuated safety interlock switches designed to fit at the leading edge of sliding, hinged or lift-off guards. The dual key entry slots and rotatable head, movable only by releasing the cover screws, allow four actuator entry options. The Trojan contains all of the safety related functions, i.e. forced guided contacts and tamper resistant mechanism, allowing the machine to be safeguarded in compliance with the machine directive. Operation of the switch is achieved through the insertion of a specially profiled stainless steel key that is permanently mounted to the leading edge of the guard door. The Trojan actuator includes a self-ejecting mechanism that prevents operation of the switch if the actuator is not mounted to the guard door (e.g. if the operator uses a spare key). The Trojan 5 has 2 N/C safety contacts and 1 N/O auxiliary contact. The Trojan 6 is available with either 4 N/C safety contacts, 3 N/C safety contacts and 1 N/O auxiliary contact or 2 N/C safety contacts and 2 N/O auxiliary contacts. The units are sealed to IP67 and has three conduit entries available in either M20 or Pg11. An optional semi-flexible actuator allows the Trojan to operate on smaller radii doors (>60mm). A catch mechanism is also available as an option for use on vibrating machinery. Trojan T15 - Compact universal tongue operated safety interlock switch Guardmaster Trojan T15 safety interlock switch The Trojan T15 is a compact universal tongue actuated safety interlock switch designed to fit at the opening edge of sliding, hinged or lift-off guards. With its dual entry slots and rotatable head, moveable only by releasing the cover screws, the Trojan T15 can offer four different options for actuator entry. The Trojan T15 features a compact housing, only 75 x 52 x 32mm and includes forced guided contacts and a tamper-resistant mechanism. The Trojan T15 has 2N/C safety contacts or 1N/C safety contact and 1N/O auxiliary contact. The unit is sealed to IP67 and has three conduit entries, M20 or Pg11. Operation of the switch is achieved by the insertion of the specially profiled stainless-steel actuator which should be permanently fixed to the leading edge of the guard door. The standard T15 incorporates an actuator retention force of 30N. There are now versions of the Trojan with the provision of a Brad-Harrison connector which allows a quick connect operation. A GD2 version is also available incorporating a metal end cap for use in demanding applications. MT-GD2 - Universal metal tongue operated safety interlock switch Guardmaster MT-GD2 Safety Interlock switch The MT-GD2 is a robust tongue actuated safety interlock switch designed to fit at the opening edge of sliding, hinged or lift-off guards. With its dual entry slots and rotatable head, the MT-GD2 can offer eight different options for actuator entry. The MT-GD2 features a compact housing of only 117mm x 40mm x 43mm with DIN 50041 standard fixing centres and includes forced guided contacts and a tamper-resistant mechanism. The MT-GD2 is available with a variety of contact configurations enabling it to be used as part of a system for higher-risk applications. The unit is sealed to IP67 and has 1 conduit entry. Operation of the switch is achieved by the insertion of the specially profiled stainless steel actuator which should be permanently fixed to the leading edge of the guard door. An optional flexible actuator allows the MT-GD2 to operate on smaller radii doors (down to 60mm) and a flat actuator gives additional mounting options. A version incorparating a latch release mechanism allows manual retention of the actuator in the switch until the release mechanism is manually activated.  Guardmaster Sprite Safety Interlock switch Developed from the highly successful Ensign, the Sprite offers the same safety related features in a more compact housing; only 75 x 25 x 29mm, making it the smallest interlock currently available. The Sprite has been designed for smaller machines such as printing machines, copiers or domestic machinery which, until now, have been unable to use standard safety interlocks due to space restrictions. Despite its diminutive size the Sprite includes the necessary safety related functions, such as forced guided contacts and a tamper resistant mechanism allowing machinery to be safeguarded in compliance with the machinery directive. The Sprite’s shaft is connected to the existing hinge pin and the degree of operation can be adjusted to suit the application via the adjustable cam in the switch head. Note: After adjustment, the cam must be secured in position with the supplied cam locking pin to ensure optimal performance. The Sprite is available with 1N/C safety contact in a watertight and dustproof IP67 housing with conduit entry (1 x M16 or 1 x Pg 9). A two-contact (1 N/C. + 1 N/O.) version with break-out cable entries and IP30 ingress protection is also available.  Guardmaster Ensign 3 safety interlock switch The Ensign 3 is a hinge actuated safety interlock switch designed to fit at the hinge point of guards. With its rotatable head, the versatile Ensign 3 offers up to four different mounting options. Operation of the unit is achieved by the hinging action of the guard. The actuation shaft is connected to the existing hinge pin and the degree of operation can be adjusted to suit the application via the adjustable cam in the switch head. Note: After adjustment, the cam must be secured in position with the supplied cam locking pin to ensure optimal performance. The switch includes the necessary safety related functions, such as forced guided contacts and a tamper resistant mechanism, allowing machinery to be safeguarded in compliance with the machinery directive. The Ensign 3 is available with one N/C safety contact and one N/O auxiliary contact or two N/C safety contacts. It is sealed to IP67 and has three conduit entries, M16 or Pg9.  Guardmaster Rotacam safety interlock switch A heavy-duty hinge actuated safety interlock switch, the Rotacam shaft can be used as, or connected to, the existing hinge pin for direct operation of the switch. Machine power is isolated when the guard has been opened just 5°. For applications requiring a larger degree of operation the internal cam can be adjusted from 5° to 11°. Note: After adjustment, the cam must be secured in position with the supplied cam locking pin to ensure optimal performance. The Rotacam is available with two N/C safety contacts and one N/O auxiliary contact. The switch includes the necessary safety related functions, such as forced guided contacts and a tamper resistant mechanism, allowing machinery to be safeguarded in compliance with the machinery directive. The die-cast housing is sealed to IP66 and features one M16 conduit entry (Pg11 or 1/2"NPT also available). Two different shaft lengths of 30mm and 85mm can also be specified.  Guardmaster Senator & Imp safety limit switches
The Senator safety-limit switches have been developed to provide a range of options including metal or plastic cases in various sizes, a choice of snap-acting, slow-break/make or 2 x N/C contacts and a choice of actuator heads. The Senator range offers the option of rotating the head before installation to allow ease of mounting. Some lever switches also incorporate a ‘programmable head’ allowing operation of the contacts when the lever is operated centre to right, centre to left or either way. The Imp offers safety switch performance of bigger units in the most compact case available. Designed with two mounting hole options and a choice of actuator positions, the Imp will fit in the most confined spaces. Guardmaster limit switches can be used in other applications other than guard doors, for example on moving machine beds, crane arms, etc. Operation of these limit switches is achieved by the sliding action of the guard or other moving object deflecting the plunger or lever. It is important that upon actuation, the guard or other moving objects should not pass completely over the switch and allow the plunger or lever to return to its original position.  Guardmaster ferrogard safety interlock switches The Ferrogard range of magnetically actuated safety switches offers non-contact reliability together with tolerance to misalignment and fail-safe operation. With versions sealed to IP67 some Ferrogards are ideal for environments where hygiene is of paramount importance. Unlike some magnetic switches, the Ferrogards have protected safety contacts to ensure that they cannot fail to danger. In addition, some versions have independent auxiliary signal contacts to indicate the machine and guard condition. Note: All Ferrogards have internal non-resettable overload protection. They should be protected by an external fuse rated as shown in the specifications table. Ferrogard 1, 2, 6, 9, 10, 20DC and 21 These safety switches are supplied sealed to IP67 and pre-wired. The cable stuffing gland locking nut has Pg7 thread, and may be removed and an adaptor fitted to allow the fitting of a conduit or other cable protection. Ferrogard types 1and 6 feature a single safety contact. The Ferrogard 6 incorporates a unique slim design of switch and actuator cases. The switch can be operated by either of two faces and the actuator has fixing holes which gives a choice of mounting configurations. Ferrogard 3, 4 and 5 These versions offer the facility of terminal connections. The robust ABS housing is sealed to IP65 and can be drilled for cable entries wherever required. The PCB switch assembly is encapsulated in the lid to ensure switching characteristics similar to Ferrogard 1, 2 and 6. The lid is secured with anti-tamper screws. Top-quality terminals with clamp plates are provided within the enclosure, clearly marked to facilitate simple and safe installation. Ferrogard GS1, GS2 & GD2 Developed for heavy-duty applications, the GS1 uses the same type of reed as the other Ferrogards but is housed in a stainless-steel body. The GS2 offers the same characteristics as the GS1 but in an Ex housing for use in hazardous atmospheres. The FRS GD2 is also now available with various contact arrangements for arduous environments. Some Ferrogards are now available with a Brad Harrison connector which gives quick connection for ease of installation. Note: Under the requirements of the Machinery Directive all machinery must undergo risk assessment to determine the necessary level (or category) of the safety-related control system or hazard-avoidance measures. Whilst the Ferrogard complies with the requirements of EN 1088 it may not be suitable for all types of machinery or environments. Where magnetic materials are present or if it is foreseeable that through machine function or use, Ferrogard operation by magnets other than the supplied actuator is possible, then use of an alternative Guardmaster switch is recommended. Other non-contact options include Sipha or Ferrocode (for category 3) which utilise additional coding techniques preventing them from being overridden by simple means. Alternatively additional measures may be taken to prevent the Ferrogard being easily bypassed. Consideration should be given to the recommended installation example given in the instructions and those in EN 1088.  Guardmaster Sipha safety interlock switch With the increasing speed and complexity of applications a simple magnetic switch may be insufficient to meet the increased risks, therefore Sipha’s design incorporates several magnetically sensitive elements which must be triggered in a particular sequence to operate the sensor correctly. Thus anything other than the Sipha actuator will not trigger the sensor. The Sipha with its moulded-in brackets and diminutive size, is extremely versatile and simple to install. The Sipha sensor must be connected to the Sipha control unit giving a monitored circuit. For high-risk applications the control unit is used with a single sensor to give a high-integrity system. For other applications, multiple sensors (including mechanical switches) can be connected to one Sipha control unit. Sipha has facilities for connecting a manual reset button and for monitoring external devices such as contactors. Four types of sensor and actuator are available, incorporating different operating distances and physical sizes. The control unit is also available in four types: Sipha 1, 2, 3 & 6. Each control unit offers options on voltages and outputs, with the Sipha 6 offering individual sensor indication and monitoring for up to 6 sensors. Ferrocode - High integrity coded safety interlock switch and control unit Guardmaster Ferrocode safety interlock switch A two-channel system, the Ferrocode setup consists of an actuator and a separate safety switch head that is connected to a monitoring control unit. The Ferrocode uses electromagnetic coding, which provides a higher level of security over magnetic coding systems. To further prevent possible override of the system, both sensor and actuator are supplied with tamper-resistant mounting hardware. The absence of moving parts and direct physical contact between sensor and actuator eliminate mechanical wear. A Ferrocode sensor may be used without the control unit for low power/ low risk applications. However, risks should be thoroughly evaluated prior to application of this method. The control unit should be used when monitoring and checking of the circuit is required. Up to 6 Ferrocode switches can be interfaced with the 110/230V control unit and up to 15 Ferrocode switches with the 24V version. A control unit may also be used in conjunction with electromechanical safety devices such as limit switches, gate interlocks and emergency stops with two contacts, 1 N/O & 1 N/C Spartan - Compact tongue operated safety interlock switch guard locking Guardmaster Spartan safety interlock switch The Spartan is a positive mode tongue operated guardlocking interlock switch that locks a machine guard closed until power is isolated, and ensures that it remains isolated while the guard is open. It is available in two contact configurations: two safety (N.C.) contacts and one auxiliary (N.O.) contact (Spartan 1) or three safety (N.C.) contacts (Spartan 2). The Spartan head has two entry slots and it can be rotated to provide four actuator entry points. A blanking plug is provided to seal the unused slot. The guard may only be opened when a signal is applied to the Spartan’s internal solenoid which releases the lock mechanism. This signal can be via a Guardmaster CU1, CU2 or CU3 control unit. Therefore the Spartan is ideal for machines which do not stop immediately or where premature interruption of the machine could cause damage to tooling and components or cause an additional hazard. The locking mechanism withstands forces up to of 1200N and an LED provides visual indication of switch status. A catch kit with actuator alignment is also supplied to relieve stress on the locking solenoid and to protect the unit from actuator damage due to poor guard alignment. Manual release points with security screws or special keys allow the locked Spartan to be released in the event of total power failure on a machine. In applications where excessive force can be generated, e.g. rebound of heavy guards, the TLS-GD2 or Atlas 5 should be considered. TLS-GD2 - Compact tongue operated safety interlock switch with guard locking – optional key release Guardmaster TLS-GD2 safety interlock switch The TLS-GD2 is a positive mode tongue operated safety interlock switch with guard locking. It locks the guard closed until the machine power is isolated and ensures that the machine remains isolated whilst the guard is open. The guard may only be opened when a signal is applied to the TLS-GD2’s internal solenoid which releases the 2000 N lock mechanism. This signal can be via a Guardmaster CU1, CU2 or CU3 control unit all incorporating a signal delay feature. Therefore the TLS-GD2 is ideal for machines which do not stop immediately or where premature interruption of the machine could cause damage to tooling and components or cause an additional hazard. The TLS-GD2 is available in three types. TLS-1 GD2 and TLS-3 GD2 incorporate a power-to-release function. The TLS-2 GD2 incorporates a power-to-lock function. Three manual release points with security screws allow the locked TLS-GD2 to be released in emergencies. An optional lid-mounted key-release version can also be supplied. All types have five sets of contacts in various forms and are suitable for use with PLCs. A stainless-steel actuator guide is fitted to protect the unit from actuator damage due to poor guard alighnment, or guard wear. Note: With the power-to-lock version, provisions should be taken to ensure that a dangerous situation can not arise from open circuit faults or power cuts Atlas 5 - Heavy duty tongue operated safety interlock switch with guard locking – optional trapped key Guardmaster Atlas safety interlock switches The Atlas 5 is a heavy-duty machine guard locking interlock switch. It uses positive-mode tongue operation and locks the guard closed until the machine power is isolated. It ensures that the machine remains isolated whilst the guard is open. It has two safety (N/C) contacts, one auxiliary (N/O) contact and a locking mechanism which can withstand forces up to 5500N. The Atlas 5 has two actuator entry points to allow ease of mounting and is supplied with a blanking plug for the unused entry. The guard may only be opened when a signal is applied to the internal solenoid which releases the lock mechanism. This signal can be via a Guardmaster CU1, CU2 and CU3 control unit. The Atlas 5 is ideal for machines which do not stop immediately, or where premature interruption of the machine could cause damage to tooling and components or cause an additional hazard. It is particularly suitable for PLC controlled machines because of the number of contacts. The Atlas 5 is supplied as a ‘power-to-release’ version and is also available with a trapped-key facility. In operation (machine running), the key is trapped in the Atlas 5 until a signal is applied to the internal solenoid. When the solenoid is energised the guard door can be opened and the key can be removed, locking the Atlas in an open state. Centurion - Mechanical timed delay bolt operated safety interlock switch Guardmaster Centurian safety interlock switches The Centurion is a positive mode thumbwheel operated machine guardlocking interlock switch that locks the guard closed until the operator manually rotates the thumbwheel, retracting the shaft from the guard door. The action of retracting the shaft initiates two functions; it isolates the power to the machine while the guard is open and, due to the operating principle, gives up to 20 seconds delay before the guard can be opened. Alternative versions with longer shafts can increase the time delay by as much as 50%. The Centurion is ideal for use on simple machines with short, constant run-down times. It is important that correct installation and operation of the unit are followed to ensure that the retractable shaft cannot be extended when the guard is open. For machines with long or variable run-down times or where frequent access is required, solenoid locking switches such as the Titan and Atlas 4 should be considered. The Centurion has 2 safety (N/C) contacts, 1 auxiliary (N/O) contact and 1 conduit entry (either M20 or Pg11). EX and Pneumatic versions of the Centurion are also available. Note: Additional safety measures (i.e. a shroud) should be used to ensure the thumbwheel can only be accessed by fingertips. << back to Safety Switches |
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