Marley QMKMS26 SPST Snap-Actio...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$66.11
Marley QMKMS26 SPST Snap-Action Line Voltage Thermostat

Marley QMKMS26 SPST Snap-Action Line Voltage Thermostat

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Model: MS26

In Stock (leaves warehouse same day if ordered before 3pm ET)

$66.11
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Marley QMKMS26 SPST Snap-Action Line Voltage Thermostat

The Marley QMKMS26 is an SPST (Single Pole, Single Throw) snap-action line voltage thermostat built for direct control of electric heating loads on standard branch circuit wiring. Its snap-action switch mechanism delivers a crisp, positive make-and-break at the set temperature point, avoiding the slow contact transitions common to slower-acting mercury or bimetal-only designs. Because it is rated for line voltage operation, the QMKMS26 wires directly into the heating circuit it controls, without the low-voltage transformer or relay staging that millivolt and low-voltage thermostat systems require. As a Marley-branded control, it is intended for the same class of electric resistance heating equipment that the Marley and QMark product families are built to support, giving contractors and facility staff a straightforward, drop-in temperature control point.

Key Features

  • SPST Snap-Action Switch: Single Pole, Single Throw contact configuration paired with a positive snap-action mechanism for dependable, repeatable on/off switching at the calibrated set point.
  • Line Voltage Rated: Designed for direct connection to line voltage circuits, wiring in-line with the heating load rather than through a separate low-voltage control stage.
  • Model QMKMS26: Marley/QMark identification number for accurate cross-referencing, replacement, and reorder against existing installations.
  • Thermostat Control Function: Provides temperature-based switching to cycle connected electric heating equipment on and off as conditions change.
  • Snap-Action Reliability: The mechanical snap action reduces contact arcing and dwell time compared to slow-make switch designs, supporting consistent long-term switching performance.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Electric Resistance Heating Control Circuits
  • Line Voltage Thermostat Installations
  • Commercial and Residential Electric Heating Equipment
  • Replacement and Retrofit Thermostat Upgrades
  • HVAC and Electric Heat Control Panels

Why Marley?

Marley has long been a trusted name behind the QMark line of electric heating equipment and controls, and the QMKMS26 carries that same emphasis on straightforward, dependable operation. Its SPST snap-action switch is built around a simple, mechanically robust design intended to hold up to repeated cycling in real-world heating control duty. For contractors and facility managers standardizing on Marley/QMark heating equipment, a matching Marley control like the QMKMS26 helps keep replacement parts and system logic consistent from the heater to the thermostat.

Manufacturer Resources

QMark Digital Catalog 2025

Product Specs

Product Type:
Thermostat
Configuration:
1-Pole
Department:
Electrical
Product Group:
Heating
list_batch:
MAR-20260910
Product Subgroup:
Thermostats

Marley MS26 – Frequently Asked Questions

1) Does the Marley QMKMS26 thermostat need a transformer or relay to control an electric heater?
No. The QMKMS26 is a line voltage thermostat, so it wires directly in-line with the heating circuit it controls. There is no low-voltage transformer or relay staging the way a millivolt or 24V control system requires. That makes it a direct control point on a standard branch circuit feeding electric resistance heat.
2) Is the Marley QMKMS26 a single pole or double pole thermostat?
Single pole. The QMKMS26 is an SPST (single pole, single throw) control with a 1-pole configuration, so it breaks one leg of the circuit only. If your heater or local wiring practice calls for both ungrounded legs of a 240V circuit to be opened at the thermostat, you need a 2-pole (DPST) control instead, not this one.
3) I'm replacing a thermostat on a QMark electric heater. Is MS26 the right part number to order?
MS26 is the Marley/QMark model designation for this SPST snap-action line voltage thermostat, and the manufacturer part number on it is MS26 (catalogued as QMKMS26). Cross-reference the number on the control you are pulling out. It is a Marley-branded control intended for the same class of electric resistance heating equipment the Marley and QMark lines are built around, so facilities standardized on that equipment keep the heater and the control on the same family.
4) What does snap-action mean on a line voltage thermostat, and why does it matter for electric heat?
Snap action means the contacts make and break with a positive, fast mechanical throw at the set point instead of drifting closed the way a slow-make bimetal or mercury design does. On the QMKMS26 that shortens the dwell time when the contacts are neither fully open nor fully closed, which reduces arcing across a resistance heating load and supports consistent switching over repeated cycling.
5) Can the Marley MS26 thermostat be used to control cooling or a fan as well as heat?
It is built as a heating control. The MS26 is a thermostat for electric heating equipment, switching the connected resistance heat on and off as the space temperature moves across the set point. It is not offered as a heat/cool or fan-changeover control, so for anything other than direct electric heat switching you want a different control.
6) Where does an SPST snap-action thermostat like the QMKMS26 typically get installed?
Three common spots: in-line on a branch circuit feeding electric resistance heat, inside an electric heat control panel, and as a like-for-like swap on an existing line voltage thermostat in a retrofit. It shows up in both commercial and residential electric heating work. Because it switches line voltage directly, the wiring point is the heating circuit itself rather than a separate control bus.
How fast can I get the Marley MS26 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Marley MS26 come with a warranty?
Absolutely. The Marley MS26 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Marley MS26?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Marley MS26 from ZenSupply?
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