Siemens Building Technology SAS81.33U Actuator

Elec/Mech Act 3pos 30sec SR

Siemens SAS81.33U Electronic Valve Actuator – 3-Position, Spring Return, 24V | Powermite 599 MT Series

Overview
The Siemens SAS81.33U Actuator is a high-performance electronic valve actuator designed for precise 3-position control of Powermite 599 MT Series valves. With spring return functionality, position feedback, and a 24V power supply, this actuator ensures reliable, fail-safe operation in building automation and HVAC systems. Its compact design and IP54 protection make it suitable for a wide range of commercial and industrial applications.

Product Features

• Brand: Siemens Building Technology

• Model: SAS81.33U

• Type: Electronic Valve Actuator

• Control: 3-Position, Floating Control Signal

• Spring Return: Yes, fail-safe function

• Voltage: 24 VAC/DC

• Power Consumption: 4.6 VA / 2.4 W (Quiet Power: 1.5 W)

• Position Feedback: DC 0…10 V

• Stroke: 5.5 mm (7/32 in.)

• Mounting Position: Upright to horizontal

• Operating Temperature: -5…55°C

• Operating Humidity: Up to 95% r.h.

• Protection Rating: IP54

• Dimensions (W x H x D): 3.66 x 5.94 x 3.15 in

• Compatibility: Powermite 599 MT Series Valves

Product Description
The Siemens SAS81.33U Actuator delivers precise, reliable control for HVAC and building automation applications. Designed to work with Powermite 599 MT Series valves, it receives a floating control signal to provide accurate three-position valve modulation. The spring return feature ensures fail-safe operation during power loss, while DC 0–10 V position feedback allows seamless system monitoring. Compact, durable, and quiet, this actuator supports installation in various orientations with IP54-rated protection against dust and water ingress.

Why Choose Siemens Building Technology Actuators?
Siemens actuators are engineered for high reliability, precise control, and long service life. Using OEM components like the SAS81.33U ensures optimal performance, compatibility, and energy efficiency in commercial and industrial HVAC systems.

Specifications

• Manufacturer: Siemens Building Technology

• Model: SAS81.33U

• Type: Electronic Valve Actuator

• Control: 3-Position Floating

• Supply Voltage: 24 VAC/DC

• Stroke: 5.5 mm

• Position Feedback: DC 0–10 V

• Mounting: Upright to horizontal

• Ambient Temperature: -5…55 °C

• Protection: IP54

• Power Consumption: 4.6 VA / 2.4 W

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