Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Siemens 540-660A Room Temperature Sensor, Beige, Indoor - Temperature Sensors
SiemensTemperature Sensors

Siemens 540-660A Room Temperature Sensor, Beige, Indoor

The Siemens Room Temperature Sensor (SKU 540-660A, MPN 540-660A) is an indoor temperature sensor with a beige finish, designed for surface mounting. It features a cable electrical connection and operates within a…

SKU 3G-OTH-70811

Also listed as: 540660A · 540 660A

Brand
Siemens
Item
540-660A Room Temperature Sensor, Beige, Indoor
Category
Temperature Sensors
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Siemens
Manufacturer Part Number
540-660A
Application
Temperature
Mounting Type
Surface Mount
Indoor/Outdoor
Indoor
Temperature Range
55° to 95°F
Electrical Connection Type
Cable
Compatible Brand and Series
Siemens Terminal Equipment Controllers (TEC)

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Siemens Room Temperature Sensor (SKU 540-660A, MPN 540-660A) is an indoor temperature sensor with a beige finish, designed for surface mounting. It features a cable electrical connection and operates within a temperature range of 55° to 95°F. This sensor is compatible with Siemens Terminal Equipment Controllers (TEC) series.

Frequently Asked Questions

What is the Siemens 540-660A room temperature sensor used for?

The Siemens 540-660A room temperature sensor is used for indoor temperature measurement in HVAC systems. It is compatible with Siemens Terminal Equipment Controllers (TEC) series and is designed for surface mounting in commercial or residential buildings to provide accurate temperature feedback for climate control.

What are the specifications of the Siemens 540-660A temperature sensor?

The Siemens 540-660A is an indoor temperature sensor with a beige finish. It has a cable electrical connection, surface mount design, and operates from 55° to 95°F. It is compatible with Siemens Terminal Equipment Controllers (TEC) series and is manufactured by Siemens.

Where to buy the Siemens 540-660A temperature sensor worldwide?

You can source the Siemens 540-660A temperature sensor through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide locations. Contact us for availability and lead time.

How to install the Siemens 540-660A room temperature sensor?

Mount the Siemens 540-660A sensor on a flat indoor wall surface using the provided mounting holes. Connect the cable to the Siemens Terminal Equipment Controller (TEC) per the wiring diagram. Avoid placing near heat sources or direct sunlight. Ensure the sensor is at typical room height for accurate readings.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens temperature sensors. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
This flush-mount analog room temperature sensor from Siemens measures ambient temperature in commercial HVAC systems. It outputs a changing-resistance signal via a thermistor to a building automation controller, enabling precise temperature regulation. Features an analog display, ±0.36°F accuracy, and quick-connect terminals for wiring
Siemens
This flush-mount analog room temperature sensor from Siemens measures ambient temperature in commercial HVAC systems. It outputs a changing-resistance signal via a thermistor to a building automation controller, enabling precise temperature regulation. Features an analog display, ±0.36°F accuracy, and quick-connect terminals for wiring
Wall-mount room temperature sensor in a plastic conduit-box housing with no display. Measures ambient temperature from 32°F to 122°F with ±0.50°F accuracy. Outputs via integrated Siemens controller over LoRaWAN protocol. Hardwired connection; includes RJ-11 tool
Siemens
Wall-mount room temperature sensor in a plastic conduit-box housing with no display. Measures ambient temperature from 32°F to 122°F with ±0.50°F accuracy. Outputs via integrated Siemens controller over LoRaWAN protocol. Hardwired connection; includes RJ-11 tool
Wall-mount room temperature sensor with flush-mount plastic housing. Measures ambient temperature from 32°F to 122°F with ±0.36°F accuracy. Connects via phone jack and supports BACnet MS/TP protocol for integration with building automation systems. No display
Siemens
Wall-mount room temperature sensor with flush-mount plastic housing. Measures ambient temperature from 32°F to 122°F with ±0.36°F accuracy. Connects via phone jack and supports BACnet MS/TP protocol for integration with building automation systems. No display
Wall-mount room temperature sensor with digital display and plastic conduit-box housing. Measures temperatures from 32°F to 122°F with ±0.90°F accuracy. Hardwired connection with integrated Siemens controller for LonWorks building automation protocols. Includes RJ-11 tool for setup. Suitable for HVAC control in commercial building automation systems
Siemens
Wall-mount room temperature sensor with digital display and plastic conduit-box housing. Measures temperatures from 32°F to 122°F with ±0.90°F accuracy. Hardwired connection with integrated Siemens controller for LonWorks building automation protocols. Includes RJ-11 tool for setup. Suitable for HVAC control in commercial building automation systems
Wall-mount room temperature sensor with digital display and plastic conduit-box housing. Measures from 32°F to 122°F with ±0.90°F accuracy. Outputs temperature data via integrated Siemens controller and supports LoRaWAN protocols. Includes RJ-11 tool for installation
Siemens
Wall-mount room temperature sensor with digital display and plastic conduit-box housing. Measures from 32°F to 122°F with ±0.90°F accuracy. Outputs temperature data via integrated Siemens controller and supports LoRaWAN protocols. Includes RJ-11 tool for installation
Siemens
Siemens
Wall-mount, flush-mount plastic room temperature sensor with hardwired connection and no display. Measures from 32°F to 122°F with ±0.50°F accuracy. Communicates via Modbus protocol for integration with building automation systems

More from Siemens

View all Siemens parts
Siemens
Siemens
Siemens 540-660B is a surface-mount temperature sensor for indoor use, measuring ambient temperature from 55° to 95°F. It connects via cable to Siemens Terminal Equipment Controllers (TEC) for HVAC control in commercial buildings
Surface-mount indoor temperature sensor with cable connection and integrated setpoint. Designed for use with Siemens Terminal Equipment Controllers (TEC) in HVAC systems. Operates within a 55° to 95°F range
Siemens
Surface-mount indoor temperature sensor with cable connection and integrated setpoint. Designed for use with Siemens Terminal Equipment Controllers (TEC) in HVAC systems. Operates within a 55° to 95°F range
Siemens
Siemens
This indoor temperature sensor from Siemens is designed for surface mounting and operates within a range of 55° to 95°F. It features a flush-mounted override button for manual adjustments and connects via cable. Compatible with Siemens Terminal Equipment Controllers (TEC), it is used for monitoring and regulating room temperature in HVAC systems
Siemens
Siemens
Surface-mount indoor temperature sensor for HVAC systems, compatible with Siemens Terminal Equipment Controllers (TEC). Features a flush mounted override button and cable electrical connection. Temperature range 55° to 95°F
Siemens
Siemens
Surface-mount temperature sensor for indoor HVAC applications. Measures ambient temperature and connects via cable to compatible Siemens Terminal Equipment Controllers (TEC) for regulation of heating, cooling, and ventilation. Operating range 32° to 122°F
Siemens
Siemens
Surface-mount indoor temperature sensor for use with Siemens Terminal Equipment Controllers (TEC). Features a cable connection and includes a setpoint. Temperature range 55° to 95°F. Suitable for monitoring and regulating room temperature in HVAC systems