I have v remote unoccupied house. area suffers power cuts so rcd or mcbs trip. could this be used to keep the mcb in on position?

No this is to lock power off when working remote from the cumsumer unit your mcb . Rcbs are a reset able fuse to protect your wiring so if your breaker are tripping you have a fault if its the your plug side start thinking what you are plugging in when it trip's or is it only one one socket As it could be appliances on sockets or a problem with a socket hope this helps

Can these be used to lock mcb in on position, where supply is for fire panel for instance? thanks

MCBs must NEVER be locked in the ON position. They are a safety device for detecting overcurrent faults and are there to break the supply safely. If you fit any device which prevents the MCB turning off then the downstream wiring could overheat during a fault condition and this may actually cause a fire. If the MCB is tripping then please seek expert advice from an electrician, as your wiring or attached equipment has a fault and could be dangerous.

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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

Product ID: 56749656

Details

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

⚡Supports up to 24 Amps current rating

📏Compact 13x7x3 cm profile

🔒Hardened steel body for max security

HK$165

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Lock in Safety, Unlock Peace of Mind

BUILT TO WITHSTAND - Crafted from hardened steel, ensuring durable and tamper-resistant lockout protection.
COMPLIANCE MADE EASY - Designed to help your facility meet or exceed local Lockout/Tagout (LOTO) safety standards.
EFFORTLESS INSTALLATION - Secure and simple panel mount design for quick, reliable lockout every time.
TRUSTED INDUSTRY LEADER - Backed by Master Lock’s 100 years of expertise in safety and security solutions.
SLIM FIT MAXIMUM SAFETY - Narrow profile enables seamless side-by-side lockouts, optimizing workspace efficiency.

The Master Lock 493B Grip Tight™ Circuit Breaker Lockout is a compact, hardened steel device designed for secure electrical lockout on standard single and double toggle breakers. Measuring 13 x 7 x 3 cm and supporting up to 24 Amps, it offers a narrow profile for side-by-side lockouts and easy panel mounting. Trusted globally, it helps professionals implement compliant and reliable Lockout/Tagout safety programs.

Specifications

ASIN	B004J173I8
Best Sellers Rank	298,104 in DIY & Tools ( See Top 100 in DIY & Tools ) 539 in Circuit Breakers 91,996 in Hardware
Brand	Master Lock
Circuit Breaker Type	Standard
Country Of Origin	China
Current Rating	24 Amps
Customer Reviews	4.6 4.6 out of 5 stars (1,325)
Global Trade Identification Number	00071649229725
Included Components	Electrical Lockout Device
Item Dimensions D x W x H	7D x 13W x 3H centimetres
Item Type Name	493B Grip Tight™ Circuit Breaker Lockout
Item Weight	0.05 Kilograms
Manufacturer	Master Lock
Manufacturer Part Number	493B
Model Number	493
Mounting Type	Panel Mount
Number of Items	1
Number of Poles	1
Product Warranty	1 year
UPC	071649229725
Unit Count	1.0 count
Voltage	240 Volts

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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HK$165

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

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