
Siemens Industrial Controls 3RT2037-1AC20 Circuit breaker
The Siemens 3RT2037-1AC20 is a heavy-duty SIRIUS Size S2 magnetic contactor engineered for demanding motor control and resistive load switching in HVACR and industrial automation systems. This 3-pole powerhouse delivers a continuous 65A current rating (AC-3 at 400V) and is capable of handling up to 30 kW (50 HP at 460V) for inductive motor loads. Designed for extreme durability, this 3RT2037 power contactor features a 24VAC 50/60Hz coil and integrated 1NO + 1NC auxiliary contacts for seamless status feedback to your control system.
Built to withstand vibration and varying climates, the Siemens 3RT2037-1AC20 industrial contactor utilizes reliable screw-type terminals to ensure a gas-tight connection, preventing thermal runaway in high-cycle environments. It is fully compatible with SIRIUS 3RV2 circuit breakers and 3RB30 overload relays, allowing for a space-saving modular motor starter assembly. With a mechanical service life of 10 million operations, it provides the rugged reliability required for mission-critical blowers, compressors, and pump skids.
Key Benefits- High Switching Capacity: Rated for 65A (AC-3) and up to 100A (AC-1) for efficient handling of large HVACR motors and heating elements.
- Integrated Control: Built-in 1NO and 1NC contacts eliminate the need for additional add-on blocks in basic interlocking circuits.
- Modular Flexibility: Seamlessly mounts to DIN rails or surfaces and integrates with the entire SIRIUS modular system for streamlined panel builds.
- Voltage Stability: The 24V AC coil is optimized for standard HVACR control transformers, ensuring reliable pull-in and hold-in currents.
- Is the 3RT2037-1AC20 a circuit breaker? No, this is a magnetic contactor used for remote load switching; it should be paired with a 3RV series circuit breaker for overcurrent and short-circuit protection.
- Can I add more auxiliary contacts to this S2 unit? Yes, the S2 frame allows for front-mounted or laterally-mounted auxiliary switch blocks to expand your control logic requirements.
- What is the maximum torque for the screw terminals? For terminal safety and optimal conductivity, ensure all main and control connections are torqued to manufacturer specifications found in the technical manual.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Siemens Industrial Controls 3RT2037-1AC20 Circuit breaker
The Siemens 3RT2037-1AC20 is a heavy-duty SIRIUS Size S2 magnetic contactor engineered for demanding motor control and resistive load switching in HVACR and industrial automation systems. This 3-pole powerhouse delivers a continuous 65A current rating (AC-3 at 400V) and is capable of handling up to 30 kW (50 HP at 460V) for inductive motor loads. Designed for extreme durability, this 3RT2037 power contactor features a 24VAC 50/60Hz coil and integrated 1NO + 1NC auxiliary contacts for seamless status feedback to your control system.
Built to withstand vibration and varying climates, the Siemens 3RT2037-1AC20 industrial contactor utilizes reliable screw-type terminals to ensure a gas-tight connection, preventing thermal runaway in high-cycle environments. It is fully compatible with SIRIUS 3RV2 circuit breakers and 3RB30 overload relays, allowing for a space-saving modular motor starter assembly. With a mechanical service life of 10 million operations, it provides the rugged reliability required for mission-critical blowers, compressors, and pump skids.
Key Benefits- High Switching Capacity: Rated for 65A (AC-3) and up to 100A (AC-1) for efficient handling of large HVACR motors and heating elements.
- Integrated Control: Built-in 1NO and 1NC contacts eliminate the need for additional add-on blocks in basic interlocking circuits.
- Modular Flexibility: Seamlessly mounts to DIN rails or surfaces and integrates with the entire SIRIUS modular system for streamlined panel builds.
- Voltage Stability: The 24V AC coil is optimized for standard HVACR control transformers, ensuring reliable pull-in and hold-in currents.
- Is the 3RT2037-1AC20 a circuit breaker? No, this is a magnetic contactor used for remote load switching; it should be paired with a 3RV series circuit breaker for overcurrent and short-circuit protection.
- Can I add more auxiliary contacts to this S2 unit? Yes, the S2 frame allows for front-mounted or laterally-mounted auxiliary switch blocks to expand your control logic requirements.
- What is the maximum torque for the screw terminals? For terminal safety and optimal conductivity, ensure all main and control connections are torqued to manufacturer specifications found in the technical manual.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Siemens 3RT2037-1AC20 is a heavy-duty SIRIUS Size S2 magnetic contactor engineered for demanding motor control and resistive load switching in HVACR and industrial automation systems. This 3-pole powerhouse delivers a continuous 65A current rating (AC-3 at 400V) and is capable of handling up to 30 kW (50 HP at 460V) for inductive motor loads. Designed for extreme durability, this 3RT2037 power contactor features a 24VAC 50/60Hz coil and integrated 1NO + 1NC auxiliary contacts for seamless status feedback to your control system.
Built to withstand vibration and varying climates, the Siemens 3RT2037-1AC20 industrial contactor utilizes reliable screw-type terminals to ensure a gas-tight connection, preventing thermal runaway in high-cycle environments. It is fully compatible with SIRIUS 3RV2 circuit breakers and 3RB30 overload relays, allowing for a space-saving modular motor starter assembly. With a mechanical service life of 10 million operations, it provides the rugged reliability required for mission-critical blowers, compressors, and pump skids.
Key Benefits- High Switching Capacity: Rated for 65A (AC-3) and up to 100A (AC-1) for efficient handling of large HVACR motors and heating elements.
- Integrated Control: Built-in 1NO and 1NC contacts eliminate the need for additional add-on blocks in basic interlocking circuits.
- Modular Flexibility: Seamlessly mounts to DIN rails or surfaces and integrates with the entire SIRIUS modular system for streamlined panel builds.
- Voltage Stability: The 24V AC coil is optimized for standard HVACR control transformers, ensuring reliable pull-in and hold-in currents.
- Is the 3RT2037-1AC20 a circuit breaker? No, this is a magnetic contactor used for remote load switching; it should be paired with a 3RV series circuit breaker for overcurrent and short-circuit protection.
- Can I add more auxiliary contacts to this S2 unit? Yes, the S2 frame allows for front-mounted or laterally-mounted auxiliary switch blocks to expand your control logic requirements.
- What is the maximum torque for the screw terminals? For terminal safety and optimal conductivity, ensure all main and control connections are torqued to manufacturer specifications found in the technical manual.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.












