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Johnson Controls A19 Series Thermostat for Hazardous Locations

Thermostat for Hazardous Locations
A19 Series

This thermostat provides remote bulb or coiled bulb sensing for hazardous environments.

• precision enclosed switch and a liquid-filled sensing element provides repeat accuracy that is unaffected by barometric pressure and cross-ambient temperature fluctuations
• SPDT switch provides open high or close high action for heating or cooling
• electrical rating permits direct control of most equipment

Select a link under the "item" tab below to order.

Cat #Switch ActionRange °F (°C)Diff F°(C°)Bulb and CapillaryRange AdjusterMax Bulb Temp °F (°C)Bulb Well (If Required)
A19AUC-1CSPDT-30 to 50 (-34 to 10)5 (2.8)3/8 in. x 4-1/16 in., 6 ft. Cap.Knob140 (60)WEL14A-602R
A19AUC-2CSPDT20 to 80 (-7 to 27)3-1/2 (1.9)3/8 in. x 4-31/32 in., 6 ft. Cap.Knob140 (60)WEL14A-603R
A19AUC-3CSPDT0 to 150 (-18 to 66)6 (3).290 x 2-1/2 in., 10 ft. Cap.Knob190 (88)WEL16A-600R
A19AUC-4CSPDT100 to 250 (38 to 121)6 (3).290 x 2-3/8 in., 10 ft. Cap.Knob290 (143)WEL16A-600R
A19BUC-2CSPDT20 to 80 (-7 to 27)3-1/2 (1.9)CoiledKnob140 (60)-
Motor Ratings VAC 120 208 240 277
Full Load Amp 16.0 9.2 8.0  
Locked Rotor Amp 96.0 55.2 48.0  
Non-Inductive Amp 22.0 22.0 22.0 22.0
Pilot Duty–125 VA, 24 to 600 VAC


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