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Brown mechanical thermostat with a rectangular plastic housing and temperature dial

Johnson Controls Inc

Johnson Controls Inc T46SAA-1C thermostat 40-90°F 24-277V AC Brown

SKU CH-WFCR-YE1Y4 MPN T46SAA-1C

Mechanical line-voltage thermostat controlling heating and cooling from 40 to 90 °F on 24–277 V AC with SPDT switching

  • Product typeLearning Thermostats
  • Product colorBrown
  • Mechanical line-voltage control handles 24 to 277 V AC
  • SPDT switch action opens or closes on temperature rise
  • 40 to 90 °F range suits heating and cooling systems
  • NEMA 1 enclosure protects internal components in indoor settings
  • 15 A resistive and 3 A inductive ratings support typical HVAC loads

Line-voltage mechanical thermostat

The Johnson Controls T46SAA-1C is a line-voltage mechanical thermostat rated for 24 to 277V AC. It uses a bi-metal sensor to control heating and cooling systems with a single stage. The unit fits a standard NEMA 1 enclosure and comes in a brown finish.

Sustained load behaviour

The SPDT switch action opens on temperature rise and closes on fall with a fixed 7°F differential. Two switches handle 15 A resistive, 36 A locked-rotor, 18 A full-load and 3 A pilot-duty ratings across the full 40 to 90°F range. Performance remains consistent without electronic drift.

Thermals noise and power

Mechanical operation produces no fan noise and draws no standby power beyond the circuit it controls. The bi-metal element reacts directly to ambient temperature inside the NEMA 1 enclosure. No external transformer or control voltage is required for the switching function.

How it compares

Measured against everything we stock in Thermostats & Thermostat Accessories, at today’s prices. Recalculated every night.

Price $177.99
Pricier than about 81% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameJohnson Controls
Model nameT46SAA-1C
Product typeLearning Thermostats
Product colorBrown

Questions about this item

Does the 15 A rating mean the T46SAA-1C generates noticeable heat when running all day?

The thermostat is a mechanical bi-metal switch rated for up to 15 A at 24–277 V AC; it does not contain active electronics, so heat output is negligible during normal operation.

What wiring must already be in place for the T46SAA-1C to control heating and cooling?

You need a line-voltage supply (24–277 V AC) and conductors for the two SPDT switch circuits plus the Hi-Med-Low fan and Heat-Cool-Off system switching terminals.

Will the T46SAA-1C replace an older two-stage mechanical thermostat without rewiring?

This model provides only a single stage of control, so it cannot directly replace a two-stage stat without changes to the wiring and control logic.

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