---
product_id: 312329399
title: "Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm"
brand: "master lock"
price: "HK$144"
currency: HKD
in_stock: false
reviews_count: 5
category: "Master Lock"
url: https://www.desertcart.hk/products/312329399-master-lock-electrical-device-493b-grip-tight-circuit-breaker-lockout
store_origin: HK
region: Hong Kong
---

# Fits 120V & 240V breakers Universal padlock compatibility Durable powder-coated steel Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm

**Brand:** master lock
**Price:** HK$144
**Availability:** ❌ Out of Stock

## Summary

> 🔐 Lock it down, power up your safety game!

## Quick Answers

- **What is this?** Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm by master lock
- **How much does it cost?** HK$144 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/312329399-master-lock-electrical-device-493b-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

- • **Compact & Portable:** Slim profile fits side-by-side breakers and easily fits in your toolkit.
- • **Secure Grip, Zero Slip:** Patented thumb-turn clamp locks breakers tight for ultimate safety.
- • **Effortless Installation:** Simple thumb turn and clamping handle for quick, reliable lockout.
- • **Universal Lock Compatibility:** Works seamlessly with all American and Master Lock padlocks and hasps.
- • **Built to Brave Harsh Conditions:** Powder-coated steel and reinforced polymer ensure rugged durability.

## Overview

The Master Lock 493B Grip Tight Circuit Breaker Lockout is a compact, durable device designed to securely lock out 120V and 240V circuit breakers. Featuring a patented thumb-turn clamp and compatibility with all major safety padlocks, it ensures reliable lockout/tagout compliance in harsh environments while being easy to carry and install.

## Description

Product Description The Mater Lock No. 493B Grip Tight™ Circuit Breaker Lockout Device fits standard height and tie-bar toggles typically found on 120 and 240 volt 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 Large

Review: Me parece de buena calidad y robusto. un poco caro pero contento con la compra
Review: Good breaker lock like the snug fit

## Features

- Fits standard height and tie-bar toggles typically found on 120 and 240 volt 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.narrow profile for side-by-side lock out.secure and simple mounting for a solid lock out..body is made from hardened steel.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004J173I8 |
| Best Sellers Rank | #176,572 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #454 in Keyed Padlocks |
| Brand | Master Lock |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,241) |
| Date First Available | 25 May 2017 |
| Item Weight | 50 g |
| Item model number | 493 |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 493B |
| Model | Electrical Lockout Device |
| Product Dimensions | 3.81 x 21.34 x 21.59 cm; 50 g |
| Voltage | 240 Volts |

## Product Details

- **Brand:** Master Lock
- **Circuit breaker type:** Standard
- **Current rating:** 1 Amps
- **Mounting type:** Panel Mount
- **Product dimensions:** 7D x 13W x 3H centimeters

## Images

![Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm - Image 1](https://m.media-amazon.com/images/I/41KEk6QWrzL.jpg)
![Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm - Image 2](https://m.media-amazon.com/images/I/51A85UsUZrL.jpg)
![Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm - Image 3](https://m.media-amazon.com/images/I/51HasiNsTJL.jpg)
![Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm - Image 4](https://m.media-amazon.com/images/I/51Vts-91owL.jpg)
![Master Lock Electrical Device 493B Grip Tight Circuit Breaker Lockout, Red & Black, 11.3 cm x 6.9 cm x 2.5 cm - Image 5](https://m.media-amazon.com/images/I/6145enWyiQL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Will these fit double pole breakers or just single pole?**
A: It would fit over one side of most 2-pole breakers, which would, in effect,  lock out the breaker.  This does not fit some larger 277V breakers.

**Q: Can this be knocked off with a hammer or pried off with a screwdriver?  I need it to be secure!**
A: All  the person you’re trying to prevent from using the electrical needs to do is remove the entire circuit breaker that has the lock on it  and replace it with another breaker to continue to use electricity. Not even locking the wall panel will help, the cover is held on with 4 screws

Your only opinion you have left is to place a metal cap over the breaker switch and connect the metal cap to the 220 feed leading into the panel

**Q: how wide does the jaws open?**
A: It's ment for a breaker. It will fit any breaker from the main power to the 15 and 20 amp ones

**Q: i need a device to lock breaker in on position to insure our church organ is not turned off accidently can i reverce this device to use it that way???**
A: This device is probably not what you want---it is intended to lock a circuit breaker in the "OFF" position for safe-maintenance situations...they make a breaker lock intended for locking a breaker in the "ON" position...it is intended for applications such as you describe---an alarm system, eg.,...the breaker will still trip if overloaded, but cannot be turned off by accident or un-authorized personnel.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by E***A on 3 April 2023*

Me parece de buena calidad y robusto. un poco caro pero contento con la compra

### ⭐⭐⭐⭐⭐ Review
*by P***E on 7 January 2026*

Good breaker lock like the snug fit

### ⭐⭐⭐⭐⭐ Review
*by A***Z on 6 October 2023*

I bought this breaker lock-out as a reminder to not turn this breaker on, unless you really need it. I use this on the 240V, 50 AMP, Electric Vehicle / Recreational Vehicle outlet that I installed under our breaker panel. Most of the time, this should be turned OFF, but on rare occassion it needs to be turned on. This Lock-out makes it really easy to remember to keep it turned Off when not needed and prevents people from turning it on by accident. The quality of construction is excellent and although I didn't need to use the fitment accessories that came with it, I appreciate that they were included. Nothing is as frustrating as not being able to finish a project beause of a fitment issue. Master Lock had this in mind and they have you covered. Great little product. I would definately buy it again.

## Frequently Bought Together

- Master Lock Red Electrical Box Circuit Breaker Lockout, Tagout Breaker Box Lock for Standard Single and Double Toggles, 493B
- TRADESAFE Circuit Breaker Lockout Device, 3 Pack, 480/600 Volt, Clamp-on Breaker Lock Out Device, OSHA Compliant, Premium Grade, Large
- TRADESAFE Lockout Tagout Locks Set - 10 Red Loto Locks, Lockout Locks Keyed Different, 2 Keys Per Lock, OSHA Compliant Lock Out Tag Out Padlocks, Safety Padlocks for Electrical Lockout Tag Out Kits

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-06*