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Motor protection

Reliable motor protection for hazardous areas
R. STAHL offers various components that have been specially designed for protecting motors in Ex Zones 1 and 2. They are built into Ex e enclosures, and are easy to install, robust, and corrosion-resistant. It goes without saying that, when it comes to switching operations, they offer 100% reliability.

R. STAHL offers a great many components with various functions for protecting motors. They are built into enclosures with Ex e type of protection and are available as motor protection circuit breakers, motor protection relays, thermistor motor protection relays, a combination of contactor and motor protection relay (max. 4, 7.5 or 11 kW at 400 V) and as contactors (max. 4 W at 400 V) with thermistor motor protection relay. All motor protection components have a corrosion-resistant enclosure and easily accessible connection terminals to make installation easier and allow for safe connection. They can be reliably secured in the enclosure with screws such that they do not vibrate.

  • Protection for motors in the form of circuit breakers, motor protection relays or thermistor motor protection relays, or alternatively in combination with a contactor
  • Easily accessible connection terminals for safe connection and easy installation
  • Vibration-proof screw connection

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Certificates
Zone Filter
Product Description
Current-setting range
Auxiliary contacts
Min. ambient temperature
Max. ambient temperature

3 Series (139 Products)

Ex Thermistor-Motor Protection Relay Series 8510 R. STAHL

Thermistor motor protection relay Series 8510

  • One device – suitable for all motor powers
  • Direct measurement of the temperature in the stator winding via PTC resistors
  • Robust modules for vibration-proof screw mounting in Ex e enclosures
Ex Motor Protection Relay Series 8510 R. STAHL

Motor protection relay Series 8510

  • Cost-effective overload protection for motors
  • The release is easy to adjust and reset
  • Robust modules, easy and vibration-proof installation
Ex Circuit-Breakers for Motor Protection Series 8523/8 R. STAHL

Moulded case circuit breakers for motor protection Series 8523/8

  • Safe switching for protecting Ex e motors
  • Release: Non-adjustable fast short-circuit release, adjustable thermal overcurrent release
  • Undervoltage releases and shunt trips are also options
  • Optional auxiliary contacts: 1 NC + 1 NO or 2 NC + 2 NO

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Sales Support

North America
+1 800 782 4357 USA
+1 877 416 4302 CAN
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