40 Amp DC Miniature Circuit Breaker 120V/240V

Key Features

• Current Rating: 40 Amps
• Voltage Rating: 120V/240V DC
• Poles: 1
• Interrupting Capacity: 10 kA
• Protection Type: Thermal-magnetic overload and short-circuit protection
• Mounting Style: Standard 35mm DIN rail
• Actuator: Trip-free toggle mechanism with clear on/off status indicator

Replaces / Cross-Reference Part Numbers

• SRDZ47-63Z
• Note: This is a DC-rated circuit breaker. Verify all electrical specifications before substituting for other models.

Compatibility & Fitment

• Application: Designed for DC circuits such as solar photovoltaic (PV) systems, battery energy storage, and other DC power distribution applications.
• Enclosure Fitment: Mounts on standard 35mm DIN rails inside compatible breaker panels, enclosures, and combiner boxes.
• Wire Compatibility: Accepts wire gauges appropriate for 40A circuits per local electrical codes.

When to Replace

• Fails to trip during a known overcurrent or short-circuit event.
• Trips repeatedly under normal load conditions.
• Will not reset after being tripped and the fault is cleared.
• Exhibits physical damage, including cracks, chips, or signs of burning/melting.
• The housing feels excessively hot during standard operation.

Installation Tips

• Disconnect and lock out all power sources before beginning installation.
• Verify breaker ratings match the specific requirements of the DC circuit.
• Mount securely onto the DIN rail, ensuring a firm connection.
• Connect line and load side wiring using the correct wire gauge.
• Tighten terminal screws to the manufacturer-specified torque to prevent poor connections and overheating.
• After installation, restore power and verify proper circuit operation.