The electrothermal actuator STA121.65 from Siemens is designed for precise control of radiator, small, and zone valves, as well as PICV. This model is maintenance-free and engineered for long-term and quiet operation, making it ideal for technical applications where reliability and minimal maintenance are crucial. It operates with an AC/DC 24 V supply voltage and is equipped with several features that facilitate installation and operation.

Application

• Control of terminal units on the water side, heating and cooling zones
• Combination with Siemens radiator valves (VDN, VEN, VPD, VPE....)
• Can also be combined with radiator valves from other manufacturers (Heimeier, Cazzaniga, Oventrop M30 x 1.5, Honeywell-Braukmann, and MNG - without the need for an adapter)
• The actuator position display is readable from a 360° angle, which simplifies monitoring and maintenance.

Features

• 24 V power supply
• Positioning time 210 s
• 2-position control
• Without connection cable
• Stroke 6.5 mm
• Valve closed when de-energized