Siemens SMFH18 Class Smf Heater Element

Product Description

The SIEMENS SMFH18 is a Class SMF bimetallic heater element designed for use with Siemens overload relays. Heater elements like the SMFH18 provide thermal overload protection by responding to heat generated under overcurrent conditions, tripping the relay before sustained overloads can damage motor windings or connected equipment. These components are selected based on full-load ampere ratings and are a standard part of motor starter assemblies in industrial and commercial electrical systems. Installation and selection are typically performed by licensed electricians or industrial maintenance technicians working to NEC guidelines.

The SMFH18 is used in applications where precise overload protection is required for three-phase or single-phase motor starters. It fits into Siemens Class SMF overload relay assemblies and is commonly found in commercial HVAC equipment, pump panels, compressor starters, and general motor control centers. The heater element is selected to match the motor full-load amps for the specific installation, ensuring accurate trip response.

Key Features

• Class SMF bimetallic heater element for Siemens overload relays
• Provides thermal overload protection for motor starter circuits
• Compact form factor suited for panel and starter assembly installation
• Lightweight at 0.044 pounds for easy handling in tight enclosures
• UPC verified for accurate procurement and inventory control

Compatibility

Designed as an OEM-style replacement heater element for Siemens Class SMF overload relay assemblies used in motor starter and motor control center applications.

Installation Notes

Installation should be performed by a licensed electrician. De-energize and lock out the motor control panel per NFPA 70E lockout/tagout procedures before removing or replacing heater elements. Select the correct heater element based on the motor nameplate full-load ampere rating and the overload relay sizing chart. Verify the element is fully seated in the relay before restoring power.

Technical Specifications

• Product Class: SMF
• Component Type: Bimetallic Heater Element
• Length: 0.311 inches
• Width: 0.154 inches
• Height: 0.154 inches
• Weight: 0.044 pounds
• UPC: 75455425936

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: SMFH18