Grip Tight™ circuit breaker lockout: Master Lock No. 491B
Master Lock No. 491B is a Grip Tight™ circuit breaker lockout device designed for tall and wide breaker handles. The product is designed to lock wide or tall breaker toggles using a patented Grip Tight™ mechanism and is used where physical blocking of the breaker's toggle is required.
What it is and what it does
The device locks the breaker's toggle by a combination of a thumb screw adjustment and a clamping handle, which ensures a grip on the toggle. Master Lock No. 491B accepts Master Lock® and American Lock® safety padlocks as well as most lockout hasps, allowing for individual locking or multi-person lockout with a hasp.
Features
- Patented Grip Tight™ design with thumb screw adjustment.
- Clamping handle for a firm grip on wide or tall toggles.
- Compatible with Master Lock® and American Lock® safety padlocks and most lockout hasps.
- Made of powder-coated steel and reinforced polymer for durability and compact storage.
Typical applications
Master Lock No. 491B fits wide or tall circuit breaker toggles, which the manufacturer states are typically found on high-voltage or high-current circuit breakers. The device is used where there is a need to prevent unintentional operation of such toggles by providing a mechanical lockable barrier.
Installation and use
The lockout is applied by placing the device's clamp over the toggle and securing it with the thumb screw and clamping handle. When the device is properly seated, a compatible safety padlock can be inserted to secure the lockout. This is the method the manufacturer describes as the primary mechanism for blocking the toggle's movement.
Specifications
- Product: Model No. 491B (Grip Tight™ Circuit Breaker Lockout, Tall and Wide Toggles)
- Manufacturer: MASTERLOCK
- Patented Grip Tight™ design with thumb screw adjustment
- Compatibility: Accepts Master Lock® and American Lock® safety padlocks and most lockout hasps
- Materials: Powder-coated steel and reinforced polymer
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