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Black and red clamp-on circuit breaker lockout with screw adjustment

Master Lock

Master Lock S3822 Circuit Breaker Lockout Clamp-On Black Red

SKU CH-JN7D-DHPYB

Clamp-on lockout secures single-pole or double-pole molded-case breakers at 480/600 V and accepts one padlock up to 9/32 in shackle

  • Clamp-on design fits 480/600 V breakers without tools
  • Accepts one padlock up to 9/32 in shackle
  • Durable nylon, stainless steel and thermoplastic construction
  • Bright black and red colours improve lockout visibility
  • Compact 1 23/32 in height suits tight panels

Circuit Breaker Lockout for Industrial Use

The Master Lock S3822 clamp-on lockout fits molded-case circuit breakers rated at 480 or 600 volts. It accepts a single padlock with a shackle up to 9/32 inch diameter. The nylon, stainless steel and thermoplastic body is built for electrical maintenance crews who need reliable energy isolation during service work.

Replaces Improvised Tie-Down Methods

This device replaces ad-hoc lockout solutions such as zip ties or tape that do not meet lockout/tagout requirements. The jump is worth it when a facility audit demands a dedicated, reusable clamp that secures directly to the breaker toggle without panel modification.

Simple Clamp-On Installation

The clamp fastens over the breaker switch with a set screw, requiring only a screwdriver. Common issues include misalignment on non-standard toggle profiles and over-tightening the screw, which can crack the thermoplastic housing.

How it compares

Measured against everything we stock in Locks, Deadbolts & Access Control, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 95% of the 358 comparable items (median $54.99).

Specifications

Product
Brand nameMASTER LOCK

Questions about this item

What screw size does the clamp-on mechanism use to secure the lockout to a circuit breaker?

The clamp-on lockout fastens with a built-in screw; no separate screw size is required for installation.

How do I correctly position the clamp before tightening the screw on a 480/600 volt breaker?

Align the clamp jaws over the breaker toggle, then tighten the screw until the lockout cannot move — do not overtighten the nylon body.

Will the nylon and thermoplastic housing become brittle after repeated lockout cycles?

The nylon, stainless-steel and thermoplastic construction resists cracking under normal industrial use; inspect before each use and replace if any damage appears.

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