Liftmaster K21-14182 Transformer, 120/240V, 24VAC, 20VA

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PRICE $39.20

Transformer, 120/240V, 24VAC, 20VA

Part Number: LM-K21-14182

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Description

The LiftMaster K21-14182 Transformer is a genuine OEM replacement electrical component designed for commercial and industrial garage door operators. This multi-tap transformer is responsible for stepping down high-line voltage to the stable low-voltage power required to run the operator’s control logic, limit switches, and safety accessories.

Core Functionality

Voltage Conversion: Efficiently converts 120V or 240V AC primary input into a stable 24V AC secondary output, ensuring the internal electronics receive consistent power.
System Power Source: Provides the critical energy needed to power Logic boards, trigger motor contactors, and maintain the functionality of safety devices such as photo-eyes.
Reliable Performance: With a 20VA (Volt-Ampere) rating, this transformer is optimized for standard commercial operators, providing a steady current flow while resisting heat buildup during frequent cycling.

Technical Specifications

Part Number: K21-14182
Primary Input: 120V / 240V AC (Multi-Tap)
Secondary Output: 24V AC
Power Rating: 20VA
Frequency: 60Hz
Mounting: Features a standard foot-mount design with pre-drilled holes for secure installation within the operator's electrical box (E-Box).

Compatibility

This transformer is a factory-specified replacement for various LiftMaster Medium-Duty and Industrial-Duty operators, including:

Medium-Duty Logic (MDL) Series
MJ Series (Medium-Duty Jackshaft)
MH Series (Medium-Duty Hoist)
MT Series (Medium-Duty Trolley)
Legacy Mechanical operators configured for 120/240V.

Installation Note

This is a multi-tap transformer. During installation, it is critical to connect the primary power to the correct leads (120V vs. 240V) based on your facility's incoming power. Wiring the transformer incorrectly can result in an immediate over-voltage failure of the logic board. Always verify the secondary output with a voltmeter before reconnecting the low-voltage harness to the circuit board.

Liftmaster K21-14182 Transformer, 120/240V, 24VAC, 20VA

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