Product Description
The Allen-Bradley 837-A3 is a Bulletin 837 Series electromechanical temperature control switch featuring Style A remote bulb and capillary sensing. It is designed for heavy-duty industrial applications where temperature must be maintained within preset limits, using vapor pressure technology for reliable snap-action switching. The 837-A3 is supplied in open type (without enclosure) configuration with a copper alloy bulb and capillary, and carries an adjustable operating range of 25 to 125°F.
Technical Specifications
| Specification | Value |
|---|---|
| Brand | Allen-Bradley |
| Model / Part Number | 837-A3 |
| Bulletin / Series | Bulletin 837 |
| Device Style | Style A — Remote Bulb and Capillary |
| Temperature Range (Adjustable) | 25 to 125°F (-3.9 to 51.7°C) |
| Enclosure Type | Open Type (without enclosure) |
| Bulb and Capillary Material | Copper Alloy |
| Sensing Technology | Vapor Pressure (Capillary Tube) |
| Contact Configuration | SPDT (Single-Pole, Double-Throw), Snap-Action |
| Contact Material | Silver |
| Non-Inductive Rating (Voltage) | 240V AC / 600V AC |
| Non-Inductive Rating (Current) | 5A @ 240V AC; 3A @ 600V AC |
| Control Circuit Rating (AC) | 125 VA, 24–600V AC |
| Control Circuit Rating (DC) | 57.5 VA, 115–230V DC |
| Standard Capillary Length | 6 ft (non-standard lengths available) |
| Adjustable Differential | Independently adjustable |
| Certifications | UL, CSA, CE |
| Product Status | Discontinued by Manufacturer |
| Weight (approx.) | 0.76 lbs |
We warranty all items for 30 days from date of purchase.
Other Details
We warranty all items for 30 days from date of purchase. If you experience any issues with your item within this period, please contact us and we will work with you to resolve the problem. This warranty covers defects in functionality but does not cover damage caused by misuse, improper installation, or normal wear and tear.Product Videos
Custom Field
GTIN 679523686208
Current Rating 5A @ 240V AC; 3A @ 600V AC
Country/Region of Manufacture USA
Voltage Rating 240V AC / 600V AC
Manufacturer Allen-Bradley
Enclosure Type Open Type (without enclosure)
Part Number 837-A3
Length 6 ft (standard)
Controller Platform Bulletin 837 Temperature Controls
Series See label
Shelf K-37
Model 837-A3
MPN 837-A3
Type Temperature Sensor
