Siemens - Safety Limit Thermostat - RAK-ST Series
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Siemens brings you the RAK-ST Series Safety Limit Thermostats, setting a new standard for temperature control and safety. With a robust design, fail-safe mechanisms, and versatile mounting options, these thermostats provide the assurance you need for critical applications.

Key Features:

  • Safety First: The RAK-ST Series is engineered to deliver top-notch safety. Equipped with a single-pole changeover microswitch, these thermostats ensure safety temperature limitation, protecting your systems and equipment.

  • Reliable Performance: With a switching capacity of 11-12 16 (2.5) A at AC 250 V, the RAK-ST Series guarantees reliable operation. Additionally, there's a terminal for alarm contact connection 11-13 at 2 (0.4) A, AC 250 V, adding an extra layer of safety.

  • Temperature Control: These thermostats adhere to DIN EN 14597 standards for time constants, ensuring precise temperature control. You can trust them to maintain the right temperature in critical applications.

  • Flexible Mounting: Choose from three mounting options: pipe, pocket, or wall mounting, making it easy to integrate these thermostats into your systems.

  • Viewing Window: The convenient viewing window in the housing allows you to check the switch-off temperature without the need for complex procedures.

  • Ambient Temperature Compensation: The RAK-ST Series incorporates ambient temperature compensation at the switching mechanism and capillary tube, ensuring consistent performance even in varying conditions.

  • Fail-Safe Design: Safety is paramount, and these thermostats are designed with a fail-safe mechanism. In the event of capillary tube rupture, contact connection 11-12 opens, preventing further operation.

  • Reset Facility: The internal reset facility, covered by a removable threaded nipple, allows for quick and easy reset procedures.

  • Protection Class: Choose between IP43 or IP54 protection classes, providing options to suit your environmental requirements.

  • Fast Installation: Featuring push-in terminals, these thermostats offer quick and hassle-free installation, minimizing downtime.

Applications:

The Siemens RAK-ST Series Safety Limit Thermostats find their utility in various critical applications:

  • Fire Protection: Ideal for fire protection thermostats in duct systems, ensuring that temperatures stay within safe limits.

  • Heat Generation: In heat generation plants, these thermostats play a pivotal role in safeguarding equipment and preventing overheating.

  • HVAC Systems: These thermostats are suitable for general use in heating, ventilation, and air conditioning systems, where maintaining temperature control is vital.

How It Works:

The RAK-ST Series operates with precision. When the limit temperature is reached, the thermostat changes over from contact 11-12 to contact 11-13 (alarm), keeping your systems safe. If the temperature subsequently falls by the switching differential, manual reset is required after removing the threaded nipple. In case of a leak in the sensing system, a fail-safe mechanism mechanically disconnects contact connection 11-12, ensuring safety under all conditions.

Part Numbers:
RAK-ST.010FP-M Safety Limit Thermostat 95ºC 700mm Capillary 100mm Pocket or Clamp-on Strap (S55700-P100)
RAK-ST.1385M Safety Limit Thermostat 40…70ºC 700mm Capillary Clamp-on Strap IP65 (S55700-P105)
RAK-ST.1430S-M Safety Limit Thermostat 80…100ºC 1600mm Capillary Clamp-on strap (S55700-P106)

Frequently Bought Together

Total price $288.00