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Siemens Electric Zone Valve Actuator: Electric Zone Valve Actuator, MT, 24V AC/DC - Fail-Safe Zone Valve Actuators
SiemensFail-Safe Zone Valve Actuators

Siemens Electric Zone Valve Actuator: Electric Zone Valve Actuator, MT, 24V AC/DC

The SIEMENS Electric Zone Valve Actuator (MPN SAS81.33U) is a fail-safe zone valve actuator designed for use with the MT series of normally open valves. It operates on 24V AC/DC power and features a spring return…

SKU 3G-OTH-69361

Brand
Siemens
Item
Electric Zone Valve Actuator: Electric Zone Valve Actuator, MT, 24V AC/DC
Category
Fail-Safe Zone Valve Actuators
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Technical Specifications

Siemens
Manufacturer Part Number
SAS81.33U
Type
MT, Spring Return, 1
AC/DC
24V
Compatible Series
MT
Compatible Valve Action
Normally Open
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS Electric Zone Valve Actuator (MPN SAS81.33U) is a fail-safe zone valve actuator designed for use with the MT series of normally open valves. It operates on 24V AC/DC power and features a spring return mechanism for fail-safe positioning.

Frequently Asked Questions

What is the SIEMENS SAS81.33U electric zone valve actuator used for?

The SIEMENS SAS81.33U is a fail-safe zone valve actuator used in HVAC systems to control water or steam flow. It is designed for normally open MT series valves and provides spring return positioning on power loss, ensuring system safety in commercial buildings.

What are the specifications of the SIEMENS SAS81.33U actuator?

The SIEMENS SAS81.33U is a 24V AC/DC electric zone valve actuator with spring return fail-safe action. It is compatible with the MT series of normally open valves. The manufacturer part number is SAS81.33U, and it is a Siemens-branded fail-safe zone valve actuator.

Where to buy the SIEMENS SAS81.33U actuator worldwide?

3G Electric supplies the SIEMENS SAS81.33U actuator worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time.

How to install the SIEMENS SAS81.33U spring return actuator?

Mount the SIEMENS SAS81.33U onto the MT series normally open valve stem, ensuring correct orientation. Connect 24V AC/DC power per the wiring diagram. The spring return engages automatically on power loss. Always follow local electrical codes and the manufacturer's installation manual.

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 fail-safe zone valve actuators. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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