Siemens SMFH11 Class Smf Overload Heater Element

Product Description

The SIEMENS SMFH11 is a Class SMF overload heater element designed for use in motor starter overload relay assemblies. Heater elements like the SMFH11 serve as the thermal sensing component inside the overload relay, responding to sustained overcurrent conditions by generating heat that trips the relay and disconnects the motor from the circuit. This protects motors from damage caused by overloading, locked rotor conditions, or phase loss. The SMFH11 is a compact, plug-in style element with an installed footprint of 0.154 inches by 0.154 inches by 0.311 inches and a shipping weight of 0.044 pounds. Electricians and motor control technicians are the primary installers of this type of component.

Class SMF heater elements are used in commercial and industrial motor control applications where SIEMENS-compatible overload relays are installed. Typical installations include motor control centers, combination starters, and panel-mounted starter assemblies protecting three-phase and single-phase motors across HVAC, pump, conveyor, and general-purpose industrial equipment. The SMFH11 is selected based on the full-load ampere rating of the motor it protects, per the sizing table for the associated overload relay series.

Key Features

• Class SMF thermal heater element sized for specific motor full-load ampere ranges
• Compact profile at 0.154 x 0.154 x 0.311 inches for tight motor control enclosures
• Plug-in design for straightforward field replacement without rewiring
• Provides thermal overload protection against sustained overcurrent and locked rotor conditions
• Lightweight at 0.044 pounds for easy handling and inventory

Compatibility

Designed as an OEM-style replacement heater element for SIEMENS Class SMF overload relay assemblies. Consult the SIEMENS heater selection table for the specific overload relay model to confirm correct ampere range selection before installation.

Installation Notes

Installation should be performed by a licensed electrician or qualified motor control technician. De-energize and lock out the motor starter per NFPA 70E and applicable OSHA lockout/tagout procedures before removing or installing heater elements. Verify the SMFH11 ampere range matches the motor full-load amps and service factor rating as shown on the motor nameplate and the overload relay heater selection table. Do not substitute heater elements across different class ratings, as incorrect sizing will defeat overload protection.

Technical Specifications

• Heater Class: SMF
• Dimensions (L x W x H): 0.154 inches x 0.154 inches x 0.311 inches
• Weight: 0.044 pounds
• UPC: 75455425929

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: SMFH11