C65H-DC(IEC60947-2/GB14048.2)

Schneider Electric C65H-DC(IEC60947-2/GB14048.2) Miniature Circuit Breaker

Configured for overload and short-circuit interruption in DC distribution circuits, the Schneider Electric C65H-DC (C65H-DC miniature circuit breaker) provides polarity-sensitive protection for DC systems. Its thermal-magnetic mechanism combines bimetallic overload protection with electromagnetic short-circuit tripping.

Hardware Specifications

Parameter	Specification
Model	C65H-DC
Brand	Schneider Electric
Product Range	Acti9 / Multi9
Product Type	DC miniature circuit breaker
Dimensions	84 mm x 36 mm x 73.5 mm (2P)
Mounting	35 mm symmetrical DIN rail
Operating Temp	-30 deg C to +70 deg C
Poles	1P / 2P
Rated Operational Voltage	250 V DC (1P); 500 V DC (2P)
Rated Insulation Voltage	500 V DC
Impulse Withstand Voltage	5 kV / 6 kV
Rated Current	1 A to 63 A
Ultimate Breaking Capacity	10 kA at 250 V DC (1P) / 500 V DC (2P)
Service Breaking Capacity	7.5 kA
Tripping Curves	C curve: 7-10 x In; K curve: 10-14 x In
Electrical Life	10,000 cycles at L/R = 2 ms
Mechanical Life	20,000 cycles
Width per Pole	18 mm
Terminal Capacity	Up to 25 mm2 rigid wire; 16 mm2 flexible wire with ferrule
Terminal Torque	2.5 N.m
Protection Degree	IP20; IP40 in modular enclosure
Standards	IEC 60947-2; GB/T 14048.2

DC Arc Control and Polarity-Sensitive Protection

The C65H-DC uses magnetic arc runners and extinguishing channels to control DC arc energy during interruption. Correct terminal polarity is required because the internal arc path directs the DC arc toward the extinguishing structure.

The thermal element responds to sustained overload current, while the electromagnetic trip mechanism responds to short-circuit current. The C curve provides standard distribution protection, whereas the K curve accommodates higher inrush-current conditions.

The device provides isolation capability according to IEC 60947-2 and incorporates a green contact-position indication. The supplied data specifies 10 kA ultimate breaking capacity for the stated 1P and 2P DC voltage configurations.

Frequently Asked Questions

Q: Does the C65H-DC require polarity-specific wiring?
A: Yes. The supplied specifications identify positive and negative terminals, requiring correct polarity for the intended DC arc-extinguishing path.

Q: What conductor sizes can the terminals accommodate?
A: Tunnel terminals accept conductors up to 25 mm2 rigid or 16 mm2 flexible with ferrules.

Q: What are the specified operating temperature and mechanical life?
A: The specified operating range is -30 deg C to +70 deg C, with mechanical life rated at 20,000 cycles.

Field Installation Guidelines

• Install the breaker on a 35 mm symmetrical DIN rail with the enclosure providing adequate mechanical retention.
• Verify positive and negative conductor polarity against the terminal markings before energizing the DC circuit.
• Select the rated current according to the protected conductor, connected load, and applicable DC protection requirements.
• Maintain separation between DC power conductors and low-level analog, communication, or measurement wiring.
• Tighten the tunnel terminals to 2.5 N.m using an appropriate torque-controlled tool.
• Use correctly sized conductors and ferrules for flexible conductors before terminal insertion.
• Do not bypass or modify the internal arc-extinguishing path or polarity-dependent terminal arrangement.
• Confirm enclosure clearance, touch protection, and the required IP rating after installation.
• Verify the breaker rating, trip curve, polarity, and circuit voltage before applying DC power.
• For maintenance, isolate the upstream source and verify absence of DC voltage before removing conductors.

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