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This guide is for electricians and homeowners needing reliable circuit protection for domestic installations. The MK Circpro H5950S Sentry Miniature Circuit Breaker offers robust safety with its 6kA breaking capacity and a 50 Amp rating, ensuring protection against overcurrents. A key benefit is its lockable dolly feature, allowing the breaker to be secured in either the ON or OFF position, which can be a limitation if not properly managed to avoid accidental operation.
| Series | Sentry |
|---|---|
| Model Part Number | H5950S |
| Brand | MK Circpro |
SP stands for Single Pole, meaning it protects one live conductor. Type B indicates its tripping characteristic – it trips between 3 to 5 times the rated current, suitable for resistive loads and general domestic circuits. 6kA is the breaking capacity, the maximum fault current it can safely interrupt.
This circuit breaker is designed and rated for AC (Alternating Current) circuits only. Using it on DC circuits is not recommended and may be unsafe.
The operating dolly typically has a provision for a small padlock. Insert the padlock shackle through the designated hole in the dolly when it is in either the ON or OFF position, and secure the padlock.
Please refer to the manufacturer's documentation or the retailer's terms for specific warranty information, as it can vary.
While robust, this breaker is specified as a 'Domestic Miniature Circuit Breaker'. For commercial applications, it is advisable to consult specific commercial-grade circuit breakers that meet the relevant standards and expected fault levels.
You can replace an existing breaker if it has the same pole configuration (SP), rated current (50 Amp), and tripping characteristic (Type B). Ensure it is mounted on a compatible DIN rail. Always consult an electrician if you are unsure.
This may indicate an overloaded circuit or a fault in an appliance. Check the total load on the circuit; if it exceeds 50 Amps, redistribute appliances. If the load is within limits, test individual appliances or consult an electrician to check for a wiring fault.
Ensure the fault that caused the trip has been cleared. If the breaker is still hot from tripping, allow it to cool. If it still won't reset, there may be an internal fault, and the breaker may need replacement.
Ensure the breaker has fully tripped or is in the 'ON' position before attempting to lock the dolly. Check for any obstructions around the dolly mechanism. If damaged, the breaker may require replacement.
Setup: The H5950S is designed for mounting onto a standard 35mm DIN rail. Ensure the power supply to the distribution board is isolated before installation. Clip the breaker onto the DIN rail and connect the line conductor to the appropriate terminal. The neutral conductor (if applicable for the circuit) should be connected to the neutral bar. Always follow local electrical regulations and codes for correct wiring.
Compatibility: This is a single-pole (SP) miniature circuit breaker. It is compatible with standard DIN rail mounting systems found in most domestic and light commercial distribution boards. The 6kA breaking capacity is suitable for typical domestic fault levels. It is rated for AC circuits.
Care: This device requires minimal care. Keep the enclosure it is housed in clean and free from dust and moisture. Periodically inspect the breaker and surrounding wiring for any signs of damage or overheating. Ensure the operating dolly moves freely when not locked.
