MK Sentry Miniature Circuit Breaker - H5963S - Sentry

The MK Sentry H5963S is designed to protect electrical circuits from damage caused by overcurrents (overloads and short circuits) in domestic installations.

No, this specific model is designed and rated for domestic installations only.

The operating dolly can be fitted with a padlock (sold separately) to keep the breaker in either the ON or OFF position, preventing unauthorized operation.

Type B indicates the tripping characteristic. It trips between 3 to 5 times the rated current and is generally suitable for resistive loads and some light inductive loads found in homes.

The 6kA rating refers to the short-circuit breaking capacity, meaning it can safely interrupt a fault current of up to 6000 Amperes.

No, the padlock accessory is sold separately.

This is a single-pole (SP) breaker, designed for single-phase circuits. It cannot be used to switch all three phases simultaneously on a three-phase system.

Check the connected circuit for overloads (too many appliances) or short circuits. Investigate appliance functionality or wiring faults.

Ensure the circuit is clear of faults and the breaker is not locked in the OFF position by a padlock. Check for physical damage to the dolly.

Re-seat the breaker firmly onto the DIN rail, ensuring the clip mechanism engages securely. Check the DIN rail itself for damage.