This resettable 40 A DC circuit breaker combines overcurrent protection and a manual On/Off isolator for 12–48 V DC systems, ideal for solar, battery and marine applications; ignition protected for safe marine use.

• Model: CB40.
• Rating: 40 A; voltage range: 12–48 V DC (suitable for 12 V, 24 V and 48 V systems).
• Type: Thermal overcurrent protection device. Material: thermal plastic (UL 94 V-0).
• Operating temperature: -32°C to 82°C (-26°F to 180°F).
• Storage temperature: -34°C to 149°C (-29°F to 300°F).
• Terminals: M6; designed for surface mounting. Ensure correct torque on M6 terminals and follow marine/automotive wiring best practice for compatibility and safety.
• Enclosure: IP67 (water resistant).
• Size: 74 x 48 x 37 mm (2.91 x 1.89 x 1.46 in). Weight: 110 g (3.9 oz).
• International standard ratings (ignition protected): SAE J1625, SAE J1171, UL1500.
• Typical applications: 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.
• Resettable design replaces single-use fuses for repeated protection; follow recommended installation torque on terminals and established wiring practices for safe, long-term operation.
• Download: Time vs Rated Current graph for Photonic Universe 40 A Circuit breaker (CB40) available to download.