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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🔐 Lock in safety, unlock peace of mind.

VOLTAGE READY - Designed for standard 240V circuit breakers, perfect for professional electrical environments.
LIGHTWEIGHT POWER - At just 59 grams, it’s easy to handle without sacrificing strength or reliability.
BUILT TO WITHSTAND - Constructed from hardened steel for unmatched durability and tamper resistance.
EFFORTLESS SECURITY - Simple, secure mounting ensures a solid lockout every time—no compromises on safety.
SLIM FIT MAXIMUM CONTROL - Narrow profile enables seamless side-by-side lockouts, maximizing workspace efficiency.

The Master Lock 493B Grip Tight™ Circuit Breaker Lockout is a compact, hardened steel device designed for secure lockout of standard single and double toggle breakers up to 240 volts. Its slim profile allows side-by-side installations, making it an essential tool for professional electrical safety compliance.

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Manufacturer	Master Lock
Brand	Master Lock
Model	Electrical Lockout Device
Product Dimensions	3.81 x 21.34 x 21.59 cm; 59.12 g
Item model number	493
Manufacturer part number	493B
Voltage	2.4E+2 Volts
Item Weight	59.1 g

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

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