Circuit Breaker Lockout: Master Lock 493B
The Master Lock 493B is a Grip Tight™ circuit breaker lockout designed for standard single- and double-toggle circuit breakers. The device is intended to grip and secure the circuit breaker's toggle using a patented Grip Tight™ mechanism, ensuring the breaker remains in the OFF position during service or maintenance.
Function and construction
The Master Lock 493B secures the circuit breaker's toggle using an adjustable clamp and a locking mechanism. The central adjustment is made with a black knob, which is turned clockwise until the jaws touch the toggle; then the red handle is closed to lock the position. The product accepts Master Lock and American Lock safety padlocks and is compatible with most lockout hasps. In terms of material, the device is made of reinforced polymer with powder-coated steel.
Installation (according to manufacturer's instructions)
- Move the circuit breaker to the OFF position.
- Open the red handle.
- Place the lockout over the circuit breaker's toggle. Turn the black knob clockwise until the clamping surfaces touch the toggle — avoid overtightening.
- Move the handle to the closed position and check that the circuit breaker cannot be moved to ON.
- Then apply an approved safety padlock to the locking point.
Datasheet and manufacturer information also describe accessories (e.g., straps and metal clips) for special toggle shapes or for metal tie-bars on double/triple circuit breakers; these are used when a better grip or attachment over a tie-bar is needed.
Documentation
See datasheet from manufacturer
Specifications
- Manufacturer: Master Lock
- Product name / item number: Master Lock 493B
- Type: Grip Tight™ circuit breaker lockout for standard single- and double-toggle
- Fits: Standard height and tie-bar toggles typically found on 120 V and 240 V circuit breakers
- Mechanism: Patented Grip Tight™ adjusted with black knob and secured with red flip-handle
- Compatibility: Accepts Master Lock and American Lock safety padlocks; compatible with most lockout hasps
- Material: Reinforced polymer with powder-coated steel
- Packaging: Red, commercial bagged packaging
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