This 40A circuit breaker combines functions of a resettable 40A fuse and On/Off switch in one unit. It is ideal for any DC system that requires both over-current protection and manual isolation of the circuit. The breaker is suitable for a wide range of DC system voltages from 12V to 48V.

Like any fuse, this circuit breaker is designed to protect the system from over-current as a result of high power draw, short-circuits, wiring mistakes, equipment faults or any other high current event. The circuit breaker is resettable which makes it a superior alternative to fuses which require replacement when blown.

Additionally, the breaker has a manual-break option which allows it to be used as an isolator On/Off switch for simple disconnection and reconnection of the system.

The circuit breaker is made from strong thermal plastic engineered to withstand high temperatures (UL94V-0 rated). The breaker is also water resistant (IP67 rated) and ignition protected (meets international standards S.A.E. J1625, J1171, UL1500).

This product is suitable for a wide range of DC applications including:

• Connecting solar or wind charge controllers to batteries;
• Between off-grid inverter DC input and batteries;
• DC power distribution or charging circuits;
• Other DC automotive and marine applications.

Click on the Details and Specifications tab for more information.

Circuit breaker specifications:

• Rating: 40A
• Type: Thermal overcurrent protection device
• Material: Thermal plastic (UL rated 94V-0)
• Operating temperature: -32C to 82C
• Storage temperature: -34C to 149C
• Terminals size: M6
• Enclosure: IP67
• Size : 74 x 48 x 37 mm
• Weight :  110g
• Waterproof rating: IP67
• International standard ratings (S.A.E. J1625, J1171, UL1500)

Please note that this circuit breaker is intended for surface mounting.

The following documents are available to download:

Time vs Rated Current graph for Photonic Universe 40A Circuit breaker (CB40)

Temperature derating graph for Photonic Universe 40A Circuit breaker (CB40)