Marley Engineered Products Transformers

Marley Engineered Products Control Transformers

Marley Engineered Products has spent over four decades engineering reliable heating and ventilation solutions for commercial, industrial, and residential environments. A critical — if often overlooked — component within those systems is the control transformer. Marley's transformers are purpose-built to step down higher line voltages to the low-voltage control signals that keep heating systems operating safely and accurately.

What Marley Transformers Do and Why They Matter

In electric heating systems, control circuits typically operate at 24V — well below the 120V, 208/240V, or even 480V line voltages that power the heating elements themselves. A transformer bridges that gap. Without a properly rated control transformer, sensitive control boards, thermostats, and relay circuits can be exposed to damaging voltage levels, leading to component failure and unsafe operating conditions.

Marley's control transformers provide consistent voltage output, helping protect sensitive control components and ensuring reliable system operation. This makes them an essential part of any well-maintained heating installation — not an afterthought.

Specific Models and Specifications

Marley offers transformers across a range of VA ratings and primary voltage configurations to match diverse installation requirements:

• Model 5814-0003-002 — a 480V primary, 24V secondary, 40VA transformer , well-suited for industrial environments where high-voltage feeds are common.
• Model 490026007 — a 208/240V primary, 24V secondary, 50VA control transformer , a workhorse for commercial and light-industrial applications.
• Model 490015003 — meticulously designed for industrial and commercial applications , this transformer handles higher VA ratings to support more demanding control loads.

These transformers are designed as both original-equipment components and direct replacement parts for Marley's QMark® and Berko® branded heater systems, ensuring drop-in compatibility when servicing existing installations.

Built into a Trusted Ecosystem

For over 40 years, Marley's trusted brands — including QMark® and Berko® — have been relied on by architects, engineers, contractors, and homeowners. Sourcing a Marley transformer means getting a component engineered alongside the heaters it supports, rather than a generic third-party substitute. Their precision-engineered control devices and electrical parts are designed to deliver consistent performance, energy efficiency, and safety in any environment.

Marley's knowledgeable and experienced technical support staff, consisting of engineers, technicians, quality and safety specialists, are available to assist with every aspect of custom solutions to fit specific spaces in a variety of building types.

Whether you're maintaining an existing Berko® or QMark® heater installation or specifying parts for a new build, Marley's control transformers are a dependable choice. Browse the full range of Marley Engineered Products to find complementary heating components and controls.