Siemens SFH17 NSMP Heater

Siemens SFH17 NSMP Heater is a thermal overload heater element designed for use with Siemens SFH thermal overload relays in magnetic motor starters. As part of Siemens ITE Circuit Protection's SFH family, the NSMP variant provides a calibrated current threshold that ensures the relay trips if motor current exceeds the set limit. The SFH17 version is rated for a motor full-load current of approximately 1.01 to 1.11 amps, aligning with Siemens' SFH heater catalog. This replacement heater is installed inside the SFH relay housing to heat the relay's sensing element and trigger protection for direct‑on‑line or controlled-start motor configurations. It is used in industrial motor control applications to safeguard motors from overheating due to overload or stalls, and is compatible with other SFH-series heater numbers within the SFH protection scheme in Siemens' catalog. When replacing, match the SFH17 NSMP heater catalog number to the exact relay model to preserve trip characteristics and protection coordination with upstream devices.