Eaton CSR 200 Amp 2-Pole 25 kAIC Main Circuit Breaker, Bolted Connection for Secure Electrical Contact, Accepts Aluminum or Copper Conductors

The Eaton Type CSR circuit breaker delivers commercial-grade protection for 200-amp residential and light commercial service entrances. This bolt-on main breaker features 25,000 AIC interrupting capacity at 240V, providing substantially higher fault current protection than standard 10 kAIC residential breakers. The CSR series represents Eaton's premium residential main breaker line, engineered for applications requiring robust service entrance protection with selective coordination capabilities.

Unlike plug-on branch breakers, the CSR utilizes bolted connections that ensure secure mechanical and electrical contact for continuous 200A loads. The breaker accepts aluminum or copper service entrance conductors from #2 AWG through 300 kcmil, accommodating everything from standard 2/0 aluminum service drops to larger commercial feeders. The thermal-magnetic trip mechanism provides inverse time overload protection while responding instantaneously to short-circuit conditions, with trip characteristics optimized for coordination with downstream branch breakers.

The horizontal toggle handle operates with clear ON/OFF positioning that meets NEC Article 240.81 requirements for service disconnect orientation. Series rating combinations with Eaton BR and CH branch breakers enable complete system coordination up to 25 kAIC, exceeding typical residential fault current levels. The breaker mounts in Eaton meter-main combinations, all-in-one panels, and conversion kits for upgrading existing loadcenters to main breaker configuration.

This CSR breaker serves as the specified main disconnect for the EG4 GridBOSS microgrid interconnect device where it transforms the GridBOSS into a code-compliant service entrance rated for direct utility meter connection. The 25 kAIC rating combines with the GridBOSS's 22 kAIC series rating to provide comprehensive system protection meeting most utility interconnection requirements.