SSC131.39U Siemens Actuator
$227.21
3-Position, Fail Safe. Powermite MT Series Actuator (S55155-A109)
Siemens SSC131.39U 3-Position Fail-Safe Valve Actuator (Powermite MT Series, 300 N, AC 24V)
Overview
The Siemens SSC131.39U is a robust, OEM electromotoric actuator designed for Powermite MT Series 2-way and 3-way valves. As a 3-position floating, fail-safe actuator, it offers reliable deployment in heating, ventilation, air conditioning (HVAC) and building automation environments. It delivers strong torque (300 N), a modest stroke (~5.5 mm), and an operating temperature range up to 248°F, making it suitable for demanding applications.
Key Features & Benefits
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Fail-safe 3-position floating control ensures system safety; actuates open/close or floating according to control signal. Amazon Web Services, Inc.
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300 N positioning force for reliable operation with various valve bodies. Amazon Web Services, Inc.
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AC 24V power – common voltage in many control systems; ease of replacement. Amazon Web Services, Inc.+1
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Short stroke (5.5 mm) for precise opening/closing and minimized overshoot. Amazon Web Services, Inc.
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Long running time under full stroke (~ 88 seconds) with ± 25% tolerance – helps the user plan actuation timing and control logic. Amazon Web Services, Inc.
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Wide operating temperature range: 34-248 °F (1-120 °C) to withstand varying system conditions. Amazon Web Services, Inc.
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LED position indication & manual override for ease of setup, diagnostics, and maintenance. Amazon Web Services, Inc.
Technical Specifications
| Specification | Detail |
|---|---|
| Brand / Series | Siemens – Acvatix / Powermite MT Series (Amazon Web Services, Inc.) |
| Model | SSC131-39U (Stock No. S55155-A109) (Amazon Web Services, Inc.) |
| Control Type | 3-Position Floating / Fail-Safe (Amazon Web Services, Inc.) |
| Voltage | AC 24V (Amazon Web Services, Inc.) |
| Stroke Length | ~ 5.5 mm (Amazon Web Services, Inc.) |
| Force / Torque | 300 N (~67 lbf) (Amazon Web Services, Inc.) |
| Running Time / Stroke | ~ 88 s ±25% for full stroke (Amazon Web Services, Inc.) |
| Operating Temp Range | 34-248 °F (1-120 °C) (Amazon Web Services, Inc.) |
| Protection / Housing | NEMA 2 / IP20 (Amazon Web Services, Inc.) |
| Additional Features | LED position indicator, manual override, fail-safe mode (Amazon Web Services, Inc.) |
Applications
Ideal for:
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Modulating flow in hydronic systems using Siemens MT Series valves (2-way and 3-way).
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Building automation zones, VAV terminals, fan coil units, terminal units etc., where fail-safe and precise 3-position control is required.
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Retrofit replacement for older actuators in 24V floating control systems.
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Environments with wide temp variation, needing reliable valve actuation.
Installation & Best Practices
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Ensure correct wiring: apply AC 24V to correct control terminals (Y1, Y2) per Siemens wiring diagram. Amazon Web Services, Inc.
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Mount actuator above horizontal orientation and avoid tension on wiring. Amazon Web Services, Inc.
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Do not supply both Y1 and Y2 simultaneously (can cause undefined behavior). Amazon Web Services, Inc.
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During commissioning, allow time for self-calibration of stroke. Amazon Web Services, Inc.
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Check LED indicator behavior to confirm position and fail-safe status.
| Weight | 2 lbs |
|---|---|
| Dimensions | 11 × 7 × 3 in |
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