Siemens 3RB Overload Relay 1NO + 1NC, 4 A Contact Rating, 50 W, 230 Vac, 3P, SIRIUS

3RN10 00: Compact, low-cost unit, with LED 'tripped' indicator and 1 changeover relay contact; reset is automatic when sensor has cooled down; control and signalling voltages should have the same potential; 3 voltage options - 24 VDC, 110 VAC or 230 VAC
3RN10 10: Standard unit with 1 N/O and 1 N/C contact; 2 'Tripped' and 'Ready' LEDs; multi-voltage 24 → 240 VAC/DC
3RN10 13: Multi-function unit with 2 changeover contacts; detects open or short-circuited sensor and has auto or manual reset options; multi-voltage 24 → 240 VAC/DC
3RN10 22: 2-sensor monitoring for ALARM and TRIP conditions; alarm operates 1 N/O contact with additional changeover contact for TRIP condition; multi-voltage 24 → 240 VAC/DC
3RN10 62: Multi-sensor evaluation relay, able to monitor up to 6 PTC sensors; Overtemperature of any one sensor will cause the output contact (1 N/O + 1 N/C) to operate; multi-voltage 24 → 240 VAC
3RB10 65. Solid state relay with a current rating of 200 A

3RN1 Series thermistor relays are a range of thermal protection devices which, when used in conjunction with external PTC thermistors, offer temperature monitoring of electrical drives, transformers and other critical components such as bearings. 3RN1 Series products operate on the principle of closed-circuit current and are therefore self-monitoring in the event of a wire breakage. All devices with the exception of the 3RN10 62 are 22.5 mm wide. The 3RN10 63 is 45 mm wide.

This overload relay is designed to provide effective electrical overload protection in various automation and electrical systems, primarily protecting motors and machinery from damage due to excessive current. Its robust construction ensures functionality in challenging environments, making it essential for professionals in automation and electrical sectors.

• Offers automatic, manual, and remote reset options for flexibility
• Includes 2 auxiliary contacts for enhanced functionality
• Operates with a control voltage of 230V AC for efficient performance
• Functions effectively within a temperature range of -25 to +60°C
• Utilises screw terminals for straightforward and secure connections

• Used in direct contactor relay systems for motor protection
• Ideal for machinery that requires high temperature overload protection
• Suitable for automation setups needing efficient electrical overload protection
• Designed for involving 3 pole relay configurations

It can be reset automatically, manually, or remotely based on your configuration.

It supports a contact current rating of up to 4A.

Yes, it is compatible with various motor types, providing appropriate overload protection.

Siemens 3RN1 Thermistor Relays

3RN1 thermistor relays are a range of thermal protection devices, which when used in conjunction with external PTC thermistors, offer temperature monitoring of electrical drives, transformers and other critical components such as bearings. The 3RN1 range operates on the principle of closed-circuit current and are therefore self monitoring in the event of sensor wire breakage.