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Siemens Auxiliary Switch: 1NO/1NC - Siemens Auxiliary Contacts
SiemensSiemens Auxiliary Contacts

Siemens Auxiliary Switch: 1NO/1NC

SKU 3G-OTH-38635

Brand
Siemens
Item
Auxiliary Switch: 1NO/1NC
Category
Siemens Auxiliary Contacts
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Technical Specifications

Siemens
Manufacturer Part Number
49CE42SPDT
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Frequently Asked Questions

What is a Siemens auxiliary switch used for?

A Siemens auxiliary switch like the 49CE42SPDT provides remote status feedback for contactors, relays, or circuit breakers. It signals open/closed positions to control panels, PLCs, or alarms in industrial automation, HVAC, and power distribution systems.

What are the specifications of the Siemens 49CE42SPDT auxiliary switch?

The Siemens 49CE42SPDT auxiliary switch is a 1NO/1NC configuration rated for 90 A max current (AC). It is a SPDT (single-pole double-throw) contact block designed for use with Siemens contactors and motor starters.

Where to buy Siemens auxiliary switches worldwide?

3G Electric supplies Siemens auxiliary switches like the 49CE42SPDT to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this genuine Siemens part.

How to install a Siemens auxiliary switch on a contactor?

Mount the Siemens auxiliary switch onto the designated slot on the contactor or relay. Ensure the switch aligns with the actuator. Wire the NO and NC terminals per your control circuit diagram. Always de-energize equipment before installation and follow Siemens guidelines.

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 siemens auxiliary contacts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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