---
product_id: 119304075
title: "Controls B121-120 Explosion Proof Temperature Switch T55903"
brand: "united electric"
price: "$16.71"
currency: USD
in_stock: false
url: https://www.desertcart.ec/products/119304075-controls-b121-120-explosion-proof-temperature-switch-t55903
store_origin: EC
region: Ecuador
---

# SPDT Switch Output Max Temp: 275°F Setpoint Range: 0° to 225°F Controls B121-120 Explosion Proof Temperature Switch T55903

**Brand:** united electric
**Price:** $16.71
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Stay Cool Under Pressure with Precision Control!

## Quick Answers

- **What is this?** Controls B121-120 Explosion Proof Temperature Switch T55903 by united electric
- **How much does it cost?** $16.71 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/119304075-controls-b121-120-explosion-proof-temperature-switch-t55903)

## Best For

- united electric enthusiasts

## Why This Product

- Trusted united electric brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Size:** Bulb dimensions of 9/16" x 1-7/8" make it easy to integrate into existing systems.
- • **Robust Design:** NEMA 4X epoxy-coated enclosure for superior durability in harsh environments.
- • **Easy Adjustment:** External adjustment with reference dial for hassle-free calibration.
- • **Precision Control:** Adjustable setpoint range ensures optimal temperature management.
- • **Versatile Application:** Ideal for various industrial settings requiring reliable temperature monitoring.

## Overview

The Controls B121-120 Explosion Proof Temperature Switch T55903 is engineered for precision temperature management, featuring an adjustable setpoint range from 0° to 225°F and a maximum temperature threshold of 275°F. Its robust NEMA 4X epoxy-coated enclosure ensures durability in challenging environments, while the SPDT switch output and external adjustment dial provide ease of use and versatility for various industrial applications.

## Description

United Electric B121-120 Temperature Switch

## Features

- Adjustable Setpoint Range: 0° to 225°F, Max. Temp: 275°F, Scale Div.: 5°
- One SPDT Switch Output, Immersion Stem, External Adjustment with Reference Dial, NEMA 4X Epoxy-Coated Enclosure
- Bulb(OD x Length): 9/16" x 1-7/8" Below Threads
- Model formerly designated with factory stock number B121-120(9006)

## Product Details

- **Operation Mode:** automatic
- **Contact Type:** Normally Open
- **Connector Type:** Screw Terminals
- **Brand:** UNITED ELECTRIC
- **Terminal:** Spdt
- **Circuit Type:** 2-way
- **Contact Material:** Copper
- **Number of Positions:** 1
- **Specification Met:** ETL
- **Connectivity Protocol:** X-10

## Images

![Controls B121-120 Explosion Proof Temperature Switch T55903 - Image 1](https://m.media-amazon.com/images/I/81vjLeng8wL.jpg)
![Controls B121-120 Explosion Proof Temperature Switch T55903 - Image 2](https://m.media-amazon.com/images/I/81td90y7k5L.jpg)
![Controls B121-120 Explosion Proof Temperature Switch T55903 - Image 3](https://m.media-amazon.com/images/I/81fxcFczQoL.jpg)
![Controls B121-120 Explosion Proof Temperature Switch T55903 - Image 4](https://m.media-amazon.com/images/I/81LuwFJA2DL.jpg)

## Frequently Bought Together

- United Electric Controls B121-120 Explosion Proof Temperature Switch T55903
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**Shop now:** [https://www.desertcart.ec/products/119304075-controls-b121-120-explosion-proof-temperature-switch-t55903](https://www.desertcart.ec/products/119304075-controls-b121-120-explosion-proof-temperature-switch-t55903)

---

*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-20*