SAF System

SAF Captive Key Interlock

Captive Key Safety Interlock Switches are designed to provide guard inhibitive interlocking. This type of actuator ensures that the guard is held securely closed and is suitable for removable, hinged or sliding guards. The Fail Safe Switches are contained inside a Polycarbonate or Metal enclosure and can only be actuated through the lock mounted on the outerface. Both the lock and enclosure are sealed to IP65 Standard. The actuating key is permanently mounted in the special handle which In2tec supplies for fixing to the guard.

Basic Elements

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 type SAF2 heavy duty knob type SAF5, lever-type SAF4 or the locking lever type SAF41 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.

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Lock  The SAFB1 lock is stainless steel IP65 sealed which was developed for severe enviroments.  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.

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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. SAF safety switches can be furnished in ganged cominbinations, in any contact configuration. They are also available seperately as general purpose safety switches.

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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.

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Note: Although enclosures are listed as optional, if they are not used it would be possible to by-pass the system by shorting out the exposed terminals. Therefore use of an enclosure is advised.

All SAF 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.

For details on the Maintenance Override System please click here

Actuators

SAF2 Extended Knob:

Suitable for use on light machinery in clean operating conditions. The knob is black plastic with integral stainless steel key.

SAF4 Lever Handle:

For heavy duty operations particularly in greasy areas or when gloves must be used. Handle gives full visual indication of interlock status. The die-cast handle is finished in red with Integral stainless steel key.

SAF41 Lock Lever Handle:

Same as the SAF4 handle with the added security lock and removable key. The handle can be locked in the open position to prevent anyone starting the machine during maintenance. It may also be locked CLOSED/POWER OFF or CLOSED/POWER ON to prevent unauthorized operation.

SAF5 Heavy Duty Knob:

Suitable for heavy duty use the Knob features a patented shroud which protects the key and prevents it from being turned until fully engaged with the lock. This extra large knob also provides excellent grip. It is Die-cast and finished in red.

Ordering Process

See the table below for a guide to the order reference codes, consisting of three parts, one for the actuator, one for the switch circuit and one for the enclosure, along with some example order codes.

 

ACTUATOR WITH STAINLESS STEEL LOCK
KNOB SAF2B
LEVER HANDLE SAF4B
LOCKABLE LEVER HANDLE SAF41B
HEAVY-DUTY KNOB SAF5B
SWITCH CIRCUIT
SINGLE POLE 11
DOUBLE POLE 21
CHANGEOVER 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 MUST USE THE PX EXTRA DEEP ENCLOSURE.

Ordering Examples

SAF2B31PX     KNOB ACTUATOR. STAINLESS STEEL LOCK. 3POLE FAIL SAFE SWITCH. EXTRA DEEP POLYCARBONATE ENCLOSURE.

SAF4B21M     LEVER HANDLE. STAINLESS STEEL LOCK. DOUBLE POLE FAIL SAFE SWITCH METAL ENCLOSURE.

SAF41B11      LOCKABLE LEVER HANDLE. STAINLESS STEEL LOCK. SINGLE POLE FAIL SAFE SWITCH. NO ENCLOSURE.

SAF41               LOCKABLE LEVER HANDLE.