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

The Schneider Electric C65H-DC, also cataloged as the C65H-DC Miniature Circuit Breaker, operates as a dedicated hardware component for overcurrent protection and fault isolation within DC control and electrical distribution circuits. The 2-pole (2P) DIN-rail device executes rapid thermal-magnetic trip sequences to safeguard downstream hardware nodes against prolonged thermal overloads and high-energy short-circuit faults under continuous current conditions.

Hardware Specifications

Schneider Electric Power Distribution Architecture

• Surge Voltage Protection Limits & Dielectric Integrity: The 2-pole breaker assembly introduces a rated impulse withstand voltage (Uimp) boundary of 5 kV. This structural gap isolates delicate industrial control elements from inductive line spikes or ambient lightning transients, ensuring surge voltage protection limits are strictly maintained without dielectric breakdown between internal contacts.
• Backplane Bus and Circuit Coordination: Built on the Acti9 industrial footprint, the breaker interfaces with standard control panel power buses. The internal C-curve magnetic configuration sets the fault clearance threshold safely above the transient inrush current profile of connected DC-to-DC converters, avoiding nuisance tripping during standard system power-up tasks.

Frequently Asked Questions

Q: Why must polarity tracking be carefully verified when wiring this DC circuit breaker?

A: Unlike standard AC variants, the C65H-DC features internal permanent magnets engineered to quench and redirect high-voltage DC electric arcs straight into the arc chutes. Reversing the positive and negative wire routing paths can cause the arc to move toward the internal mechanism, damaging the device during short-circuit clearing events.

Q: How does the module handle thermal derating when operating in panels above 40 deg C?

A: The 3 A nominal current rating is calculated at a 40 deg C ambient baseline. Operating the hardware in high-temperature environments shifts the bi-metallic thermal strip curve, requiring proportional derating of the maximum continuous load current to prevent premature thermal tripping.

Field Installation Guidelines

• Chassis Layout Alignment, Clearance Constraints, and Mechanical Seating: Snap the 220 g breaker module directly onto a level 35 mm symmetric DIN rail frame. Ensure the device locks securely into position with the front toggle moving freely, and preserve at least 20 mm of vertical clearance above and below the tunnel terminal openings to accommodate wire bend radiuses.
• Conductor Separation, Wireway Constraints, and Shield Grounding: Route all heavy DC power distribution lines through panel wireways separated from low-voltage analog sensor cables or communication links. Insert conductors ranging from 1 to 25 mm² into the top or bottom tunnel clamps, and torque the terminal screws to exactly 2.5 Nm to prevent loose connections under thermal expansion cycles.