Will these fit double pole breakers or just single pole?

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.

Can this be knocked off with a hammer or pried off with a screwdriver? I need it to be secure!

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

how wide does the jaws open?

It's ment for a breaker. It will fit any breaker from the main power to the 15 and 20 amp ones

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???

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.

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Master Lock 493B Grip Tight™ Circuit Breaker Lockout for Electrical Lockout on Standard Single and Double Toggles, 13 x 7 x 3 cm

Master Lock 493B Grip Tight™ Circuit Breaker Lockout for Electrical Lockout on Standard Single and Double Toggles, 13 x 7 x 3 cm

Product ID: 312329399

Details

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

⚡Fits 120V & 240V breakers

🔒Secure grip with patented clamp

🛠️Durable powder-coated steel build

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€ 25.86

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Lock it down, power up your safety game!

LOCKOUT READY - Accepts all American Lock® and Master Lock® padlocks for full safety compliance
RUGGED DURABILITY - Powder-coated steel and reinforced polymer built to withstand harsh jobsite conditions
COMPACT PORTABLE - Slim 13x7x3 cm design fits easily in your toolkit or pocket
UNIVERSAL COMPATIBILITY - Fits standard single & double toggle breakers up to 240 volts
PATENTED GRIP TIGHT™ LOCKING - Effortless thumb-turn clamp for a rock-solid hold on toggles

The Master Lock 493B Grip Tight™ Circuit Breaker Lockout is a compact, durable device designed to securely lock out standard 120V and 240V circuit breakers. Featuring a patented thumb-turn clamp mechanism, it ensures a tight grip on single and double toggle breakers. Constructed from powder-coated steel and reinforced polymer, it withstands harsh environments and accepts most safety padlocks for full lockout compliance.

Specifications

ASIN	B004J173I8
Best Sellers Rank	#233,749 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #610 in Keyed Padlocks
Brand	Master Lock
Brand Name	Master Lock
Circuit Breaker Type	Standard
Circuit breaker type	Standard
Current Rating	1 Amps
Current rating	1 Amps
Customer Reviews	4.6 out of 5 stars 1,278 Reviews
Global Trade Identification Number	00071649229725
Included Components	Electrical Lockout Device
Item Dimensions D x W x H	7D x 13W x 3H centimeters
Item Type Name	493B Grip Tight™ Circuit Breaker Lockout
Item Weight	0.05 Kilograms
Manufacturer	Master Lock
Model	493
Mounting Type	Panel Mount
Mounting type	Panel Mount
Number of Poles	1
Number of poles	1
Part Number	493B
Product dimensions	7D x 13W x 3H centimeters
Smart Home Compatibility	Not Smart Home Compatible
UPC	071649229725
Unit Count	1 Count
Voltage	240 Volts

Reviews

E**A

Bien material

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

3.04.2023

P**E

No more accidents

7.01.2026

J**C

Good for the price

28.02.2026

I**Z

Buen precio para el material

6.06.2025

S**S

Isolation lock off device

2.06.2021

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