Marley Q-Mark HBBT2 2-Pole The...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$114.10
Marley Q-Mark HBBT2 2-Pole Thermostat, 120-277V AC, 25A

Marley Q-Mark HBBT2 2-Pole Thermostat, 120-277V AC, 25A

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Model: HBBT2

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

$114.10
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Marley Q-Mark HBBT2 2-Pole Thermostat, 120-277V AC, 25A

The Marley Q-Mark HBBT2 is a 2-pole thermostat built for dependable temperature control on electrical circuits rated 120-277V AC and 25A. Designed for commercial and industrial use, this thermostat gives installers a single, compact control point for equipment that operates across a wide voltage range, so the same part number can be specified on 120V, 208V, 240V, or 277V systems without swapping components. Its 2-pole construction switches both circuit conductors together, which helps ensure the connected load is fully de-energized when the thermostat calls for off, a detail that matters on higher-voltage line-voltage circuits. The HBBT2's 25-amp rating gives it the switching capacity to control heating or climate equipment directly, without requiring an intermediate contactor in many typical installations, which can simplify wiring and reduce the number of components in the control circuit.

Key Features

  • 2-Pole Switching: Independently interrupts both circuit conductors for complete, dependable control of the connected load rather than switching a single leg.
  • Wide Voltage Range: Rated for 120-277V AC, allowing one thermostat model to cover standard 120V branch circuits as well as higher 208V, 240V, and 277V commercial systems.
  • 25-Amp Rating: Sized to handle the current draw of typical line-voltage heating and control circuits found in commercial and light industrial buildings.
  • Q-Mark Series Design: Part of the established Marley Q-Mark HBBT2 thermostat line, engineered for consistent, code-compliant switching performance.
  • Simplified Specification: A single 120-277V AC rated device reduces the number of unique thermostat SKUs an electrical contractor or facilities team needs to stock across mixed-voltage buildings.
  • Commercial-Grade Build: Constructed to hold up to regular cycling and everyday handling in commercial, industrial, and light institutional settings where equipment runs on a routine schedule.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Electric Heating Equipment Control
  • Commercial and Industrial Electrical Systems
  • Line-Voltage Temperature Control Circuits
  • Multi-Voltage Building Retrofits and New Construction
  • Panel-Mounted or Wall-Mounted Thermostat Installations

Why Marley?

Marley's Q-Mark line is built to deliver dependable, code-compliant performance for demanding commercial and industrial electrical applications. The HBBT2's 2-pole, 120-277V AC, 25A design reflects the durable engineering professionals expect from the Q-Mark name, giving contractors a single thermostat that can be specified with confidence across a range of building voltage systems. Choose Marley for electrical control components built to perform reliably day after day.

Product Specs

Product Type:
Thermostat
Voltage Rating:
120-277V
Amperage Rating:
25A
Configuration:
2-Pole
Department:
Electrical
Product Group:
Heating
list_batch:
MAR-20260910
Product Subgroup:
Thermostats

Marley HBBT2 – Frequently Asked Questions

1) Will the Marley Q-Mark HBBT2 thermostat work on a 277V heater circuit?
Yes. The HBBT2 is rated 120-277V AC, so the same part number covers 120V branch circuits as well as 208V, 240V and 277V commercial systems. That is why electrical contractors stocking mixed-voltage buildings can carry one thermostat instead of a voltage-specific device for each system.
2) How much heater load can the HBBT2 thermostat switch without a contactor?
The HBBT2 carries a 25A switching rating, which is enough to control typical line-voltage electric heating and climate circuits directly. In many installations that removes the need for an intermediate contactor, so the control circuit is just the thermostat and the load. Size the heater's actual current draw against that 25A ceiling before you wire it direct.
3) What does 2-pole mean on this Q-Mark thermostat, and do I need it instead of single-pole?
Two-pole means the HBBT2 interrupts both circuit conductors together rather than switching one leg. On a 208V, 240V or 277V line-voltage circuit both legs are hot, so a single-pole stat leaves the load energized on one side when it calls for off. If your heater runs on a two-hot-leg circuit and you want it fully de-energized at the stat, the 2-pole version is the one to specify.
4) Is the HBBT2 a line-voltage thermostat or a low-voltage control stat?
Line voltage. The HBBT2 switches the heater circuit itself at 120-277V AC and 25A, so it wires in series with the load rather than driving a 24V control circuit. If your equipment expects a 24V low-voltage signal, this is the wrong type of stat.
5) What is the exact part number to order this Marley Q-Mark 2-pole thermostat?
Order it as Marley Q-Mark HBBT2. That single model number covers the 2-pole, 120-277V AC, 25A configuration, and there are no separate voltage or amperage variants to specify.
6) For a facility running heaters at several different voltages, can one thermostat model be standardized across all of them?
Yes, and that is the practical argument for the HBBT2 for an MRO or facilities stockroom. One device rated 120-277V AC drops the number of unique thermostat part numbers you hold across a mixed-voltage building, whether that is a retrofit or new construction.
How fast can I get the Marley HBBT2 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 HBBT2 come with a warranty?
Absolutely. The Marley HBBT2 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 HBBT2?
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 HBBT2 from ZenSupply?
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