Eaton / Cutler-Hammer CSH2175N Molded Case Circuit Breaker

The CSH2175N is designed for use as a main breaker in Eaton CH series load centers and Type ECB unit enclosures.

Both are 175A, 2-pole main breakers with the same physical dimensions, but they have different interrupting ratings. The CSR2175N is rated at 25kAIC, while the CSH2175N offers a higher 35kAIC rating for systems requiring greater fault current protection.

This breaker mounts directly to the interior bus of the load center. It is secured over the studs using 1/4-20 nuts, which must be torqued to the manufacturer's specifications. Always ensure power is disconnected before installation.

The terminal lugs are rated for both copper and aluminum conductors, accepting wire gauges from 2 AWG up to 300 kcmil. Ensure proper torque is applied to the lugs during installation to maintain a secure connection.

The CSH2175N is required when the electrical system's available fault current exceeds 25kAIC. Its 35kAIC rating at 120/240VAC provides the necessary interrupting capacity for higher fault current environments, whereas standard CSR breakers are only rated for 25kAIC.

It utilizes a fixed thermal-magnetic trip unit. The thermal element provides long-time protection against sustained overloads, while the magnetic element delivers instantaneous protection against short circuits.

Yes, terminal insulators must be installed on the service entry cable and line-side lugs of the main breaker. Eaton typically includes these kits with 225A and smaller main breaker load centers from the factory.