---
product_id: 312329391
title: "Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm"
brand: "master lock"
price: "€ 34.64"
currency: EUR
in_stock: true
reviews_count: 5
category: "Master Lock"
url: https://www.desertcart.es/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout
store_origin: ES
region: Spain
---

# Fits hi-voltage breakers Universal padlock compatibility Durable powder-coated steel Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm

**Brand:** master lock
**Price:** € 34.64
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock it down, power up safety — the pro’s choice for breaker lockout!

## Quick Answers

- **What is this?** Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm by master lock
- **How much does it cost?** € 34.64 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout)

## Best For

- master lock enthusiasts

## Why This Product

- Trusted master lock brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built for Extremes:** Zenex composite body resists chemicals & temps from -57°C to 182°C.
- • **Compact Powerhouse:** Slim, lightweight design fits easily in your toolkit or pocket.
- • **Rugged Reliability:** Hardened steel and reinforced polymer ensure long-lasting performance in harsh environments.
- • **Secure Grip, Zero Slip:** Patented thumb-turn clamp locks breakers tight for ultimate safety.
- • **Universal Lock Compatibility:** Works seamlessly with all American & Master Lock padlocks and lockout hasps.

## Overview

The Master Lock 491B Grip Tight Circuit Breaker Lockout is a compact, durable device designed to securely lock out wide or tall hi-voltage circuit breakers. Featuring a patented thumb-turn clamp, it ensures a tight grip on toggles and accepts all major safety padlocks. Built with powder-coated steel and Zenex composite, it withstands extreme temperatures and harsh conditions, making it an essential safety tool for professionals.

## Description

Product Description The Master Lock No. 491B Grip Tight Circuit Breaker Lockout Device fits wide or tall breaker toggles typically found on hi-voltage/hi-amperage breakers. The innovative patented Grip Tight design effectively locks out circuit breakers with a simple thumb turn and then close clamping handle for a tight grip on the toggle. Device accepts all American Lock® and Master Lock® safety padlocks and most lockout hasps for full lockout. Durable construction stands up in harsh environments and compact design is easy to carry and store. Set Contains: 1 x Master Lock Lockout Circuit Breaker Small

Review: Muy buen producto para el trabajo
Review: Commande reçu à temps et quantité exact contrairement à d’autre. Top top

## Features

- Fits wide or tall breaker toggles typically found on hi-voltage/hi-amperage breakers
- Adjust to breaker with simple thumb turn and then close clamping handle for a tight grip on the toggle
- Durable construction with powder coated steel and reinforced polymer for operation in harsh environments
- Compact lockout device is easy to carry and easy to store
- Accepts all American Lock and Master Lock safety padlock shackles and lockout hasp diameters.Zenex composite body, which withstands chemicals and extreme temperatures ranging from -57 to 182.have a secure and simple mounting for a solid lock out..body is made from hardened steel.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004J173HY |
| Best Sellers Rank | #87,153 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #194 in Keyed Padlocks |
| Brand | Master Lock |
| Color | Red |
| Customer Reviews | 4.7 4.7 out of 5 stars (496) |
| Date First Available | 1 May 2014 |
| Item Weight | 45.4 g |
| Material | Steel |
| Model Number | 491B |
| Product Dimensions | 10.16 x 5.08 x 2.54 cm; 45.36 g |
| Voltage | 120 Volts |

## Product Details

- **Brand:** Master Lock
- **Circuit breaker type:** Standard
- **Current rating:** 2 Amps
- **Mounting type:** Snap-In Mount
- **Product dimensions:** 51D x 25W x 25H millimeters

## Images

![Master Lock Electrical Device 491B Grip Tight Circuit Breaker Lockout, Red & Black, 14.7 cm x 8.4 cm x 3.4 cm - Image 1](https://m.media-amazon.com/images/I/61GT6MscUTL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by E***. on 4 June 2025*

Muy buen producto para el trabajo

### ⭐⭐⭐⭐⭐ Review
*by H***F on 1 September 2024*

Commande reçu à temps et quantité exact contrairement à d’autre. Top top

### ⭐⭐⭐⭐⭐ Review
*by R***R on 19 December 2019*

Worked perfectly for my job. Allowed me to lock out 575v circuit breaker without problems

## Frequently Bought Together

- Master Lock 491B Lockout Tagout Circuit Breaker Lockout, Tall and Wide Toggles, Red
- Master Lock Red Lockout Tagout Safety Padlock with Key, Metal Shackle and Non-Conductive Lock Body for Electrical Applications, 410RED
- Master Lock Safety Series 1' Jaw Steel Lockout Hasp

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**Shop now:** [https://www.desertcart.es/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout](https://www.desertcart.es/products/312329391-master-lock-electrical-device-491b-grip-tight-circuit-breaker-lockout)

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-01-25*