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Red plastic and steel miniature breaker lockout, pin-out wide design, .7 by 4.5 by 2.4 inches

Master Lock

Master Lock S2391 Mini Circuit Breaker Lockout Pin-Out Wide

SKU CH-3T3Z-DNWH2

Miniature circuit-breaker lockout with pin-out design fits 1/2 in and 7/16 in toggles, accepts one padlock up to 9/32 in shackle, rated 120/277V AC

  • TypeAlignment Tools
  • Fits 1/2 in and 7/16 in breaker toggles with pin-out mount
  • Accepts one padlock up to 9/32 in shackle for secure isolation
  • Rated for 120/277V AC circuits on DIN-style miniature breakers
  • Red plastic and steel construction resists impact and corrosion
  • Compact at 4.5 in long, 2.4 in wide and .7 in high

Mini Circuit Breaker Lockout S2391

The Master Lock S2391 Mini Circuit Breaker Lockout Pin-Out Wide is designed for electrical professionals performing lockout/tagout procedures on miniature DIN-style circuit breakers. It secures single-pole breakers with 1/2 in or 7/16 in toggle openings, compatible with 120/277V AC systems. The device accepts one safety padlock with a maximum 9/32 in shackle diameter.

Pin-Out Wide Design and Material

The pin-out wide mounting style and red plastic/steel construction provide a secure fit on compatible miniature breakers. This design allows the lockout to engage the breaker toggle directly, preventing accidental re-energisation during maintenance. The bright red colour ensures high visibility on the panel for quick identification.

Simple Installation With One Padlock

Installation involves aligning the pin-out mechanism with the breaker toggle opening and securing it with a single Master Lock or American Lock safety padlock. The unit measures 4.5 in long, 2.4 in wide, and .7 in high. Ensure the breaker toggle dimensions match the 1/2 in or 7/16 in specifications before application.

Highlights

  • Fits 1/2 in and 7/16 in breaker toggles with pin-out mount
  • Accepts one padlock up to 9/32 in shackle for secure isolation
  • Rated for 120/277V AC circuits on DIN-style miniature breakers
  • Red plastic and steel construction resists impact and corrosion
  • Compact at 4.5 in long, 2.4 in wide and .7 in high

Specifications

BrandMASTER LOCK
TypeAlignment Tools

Questions about this item

Will the plastic body of the S2391 need replacement if it cracks after repeated lockout cycles?

The lockout is built from plastic and steel; if the plastic housing cracks it cannot be repaired and the whole unit must be replaced.

What stops me from using the S2391 on a breaker wider than the 0.7 inch toggle opening?

The pin-out design only fits 1/2 inch and 7/16 inch toggles; anything wider will not engage the lockout pins.

Does the red plastic housing get too hot to touch when the breaker carries 277 V AC continuously?

The lockout carries no current itself, so it stays at ambient temperature regardless of the 120/277 V AC circuit load.

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