Sursum SMSIIe Overcurrent Circuit Protection Device

The SURSUM SMSIIe is a manual-reset, single-pole thermal circuit breaker that provides overcurrent and short-circuit protection for industrial, marine, and transportation electrical installations. It is commonly installed in marine equipment, rail systems, telecommunications infrastructure, battery-powered equipment, DC power distribution panels, control panels, and industrial automation systems that require compact thermal protection with manual reset capability. Configuration options include panel-mount or snap-in mounting, with either quick-connect or screw-terminal terminations, depending on the configuration; operating voltage and current rating, as well as interrupt capacity, are model-dependent. The device uses a thermal trip mechanism and is housed in industrial thermoplastic suitable for industrial, transportation, and marine environments. Common replacements for the SMSIIe include the E-T-A 3120 Series, Schurter TA35, and Carling Technologies C Series circuit breakers.