Siemens MP24015 15/40A Triplex Miniature Circuit Breaker

This breaker is rated for 120/240VAC, single-phase service. Use those voltage and phase ratings when selecting it for the intended circuit.

The interrupting rating is 10kA at 120/240VAC. The available fault current at the installation point must not exceed that rating; interrupting capacity is separate from the breaker's normal current rating.

Thermal-magnetic protection uses a thermal response for sustained overloads and a magnetic response for high-current faults. This breaker has long-time and instantaneous trip functions with fixed settings, so select the required protection rather than planning to adjust it in the field.

The wire range is 14-4 AWG, with load-side lug connections. Select conductors within that termination range while also meeting the circuit's ampacity requirements; acceptance by the lug alone does not determine the correct conductor size.

This breaker uses plug-on mounting. Plan installation around that connection method, with outgoing circuit conductors terminated at the load-side lugs.

HACR refers to heating, air-conditioning, and refrigeration applications. This marking matters when the equipment's circuit-protection requirements call for a HACR breaker; the current, voltage, and interrupting ratings still govern selection.

SWD indicates suitability for switching fluorescent lighting loads. It is relevant when the breaker will serve as the switching device, rather than only providing overcurrent protection.

Check the 15/40A amperage rating against the circuit load and conductor ampacity when selecting overcurrent protection. The trip setting is fixed, so select the required protection rather than relying on field adjustment.