The Captive Key system locks the guard closed, while the machine is running and switches the power OFF before the Guard can be opened. It works with removable,hinged or sliding guards and is accepted by H.M. Factory Inspectorate and the Health and Safety Executive.

The three fundamental components of the GW Safety Interlock System are listed below. The Captive-Key Actuator may take various forms, depending on the application. The switches may have several contact arrangements.

  1. Captive-Key Actuator  The core of the actuator is a cylindrical, hardened-steel, coded key with 2 lugs that engage shoulders within the lock to provide positive interlocking for the OFF and ON positions. Externally the Actuator may have the extended knob form GW5, lever-type GW7 or the flush-mounting type GW61 as described below. The circular mounting flange of the Actuator is secured to the guard or cover at assembly with 4 rivits,which are then consealed by the OPEN-ON-OFF decal installed for indicating the Interlock status. The knob or handle is spring loaded, and must be depressed to engage the captive key into the lock and operate the fail-safe switch.Click here for further details on Actuators
  2. Lock  The GWLK1 lock is a high-security, six pin radial-tumber type, of machined brass with chrome-plated finish. It is secured to the body or frame of the guarded equipment, within the guarded area. It's prime function is to lock the switch in the OFF position whenever the guard is open or removed.While the captive-key in the Actuator is engaged in the lock it's steel lugs are locked beneath the lock body rim, and are only released in the OPEN position. The lock bezel is tampered matching the opening in the base of the Actuator to enforce accurate mating of the elements when the guard is closed. Click here for further details on locks.
  3. Positive Action Safety Switch  The switch components are housed in a moulded, glass-filled nylon case. Operation is positive and mechanical. the large, heavy duty contacts are mounted on an actuating arm which is directly driven by a cam operated by the main lock spindle. this cam is indexed to the OPEN-ON-OFF postions and the acceleration by this cammed indexing ensures fast, positive seperation of the switch contacts.  One end of the contact arm is trapped, providing a secondary fulcrum that assures full contact seperation under all conditions.  All springs are pocketed in isolated compartments, so that they can never enter the contact area. GW safety switches can be furnished in ganged cominbinations, in any contact configuration. They are also available seperately as general purpose safety switches.Click here for further details on Fail-safe Switches
  4. Enclosure(optional)  The standard switch enclosure,which accommodates single or double pole switches is made from high inpact polycarbonate or cast aluminium, and includes an integral sealing gasket and tamper-proof cover screws, sealing to IP65.Click here for further details on enclosures

    Note: Although Enclosure is listed as optional if it is not used it would be possible to by-pass the system by shorting out the exposed terminals. Therefore use of the Enclosure or an equivalent terminal Enclosure should be used.

    All GW Systems Elements are installed with blind roll pins or rivits, so that they cannot be taken apart or tampered with in use. The switch is pinned to the lock body on final assembly by 2 blind roll pins. All required hardware is supplied with the system.

GW5 Extended Knob:
Suitable for manual operation especially where a guard may require regular removal.
GW7 Lever Handle:
For heavy duty operations particularly in greasy areas or when gloves must be used. Handle gives full visual indication of interlock status.
GW61 Flush Button:
Button is operated by an Allen-Key, useful where surface obstructions must be minimized.
GW14 High Security Maintenance Override:
Consists of a Fail Safe Switch, a multi-pin high security, radial lock, and a removable key. Used for overriding the standard interlocks for maintenance in installations having move than 1 interlock. The key used in model GW14 is NOT interchangeable with normal interlock keys. This model should be mounted so that the guard cannot be replaced while the key is in the override lock. For further details on the Maintenance Override System Please click here.

Use the tables below to build yours switch type

ACTUATOR

SWITCH CIRCUIT

ENCLOSURE

  

  

  

      

ACTUATOR WITH BRASS LOCK
KNOB
GW5
 
 
LEVER HANDLE
GW7
 
 
HIGH SECURITY KEY
GW14
 
 
FLUSH 4MM SOCKET
GW61
 
 
SWITCH CIRCUIT
SINGLE POLE
 
11
 
DOUBLE POLE
 
21
 
CHANGE OVER
 
22
 
THREE POLE
 
31
 
DOUBLE POLE + INDICATOR
 
32
 
CHANGEOVER + INDICATOR
 
33
 
ENCLOSURE
POLYCARBONATE MOULDED STANDARD
 
 
P
POLYCARBONATE MOULDED EXTRA DEEP
 
 
PX
METAL DIE-CAST
 
 
M

NB. 3 POLE OPTIONS IN POLYCARBONATE ENCLOSURE ONLY. THESE USE THE PX EXTRA DEEP ENCLOSURE.

GW531PX      KNOB ACTUATED BRASS LOCK 3POLE FAIL SAFE SWITCH EXTRA DEEP POLYCARBONATE ENCLOSURE.

GW6121M     FLUSH ACTUATOR-4MM SOCKET BRASS LOCK DOUBLE POLE FAIL SAFE SWITCH METAL ENCLOSURE.

GW711          LEVER HANDLE BRASS LOCK SINGLE POLE FAIL SAFE SWITCH NO ENCLOSURE.

GW5                 KNOB ACTUATOR 

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