Siemens NSB E43B015 Molded Case Circuit Breaker

Siemens NSB E43B015 Molded Case Circuit Breaker is a three-pole, 15-amp molded-case breaker designed to protect three-phase feeders in commercial and light-industrial distribution up to 480 V. It uses a thermal-magnetic trip unit to provide overload protection and fast short-circuit disconnection, with an 18 kA short-circuit rating at 480 V. In Siemens catalogs this model is listed as E43B015 and also appears as ED43B015 or HED43B015 across the E/ED/HED family, reflecting cross-compatibility within Siemens' low-voltage MCCB line. The NSB E43B015 is part of the legacy ITE/SIEMENS lineup that integrates with standard Siemens distribution gear, offering consistent trip characteristics and coordination with other protection devices in typical three-phase panels. This breaker is appropriate for protecting feeders and branch circuits where 15 A protection is required and where 480 V operation is provided, such as in commercial or light-industrial electrical distributions that rely on Siemens protection schemes.