Siemens 3RT2327-1AF00 Contactor 4-Pole, AC-1, 50A, 110V AC Coil, S0 Size Original Brand New

Siemens 3RT2327-1AF00 Contactor – High-Performance 4-Pole AC-1 Switching

The Siemens 3RT2327-1AF00 is a robust and reliable 4-pole contactor designed for efficient switching of AC-1 (non-inductive or weakly inductive) loads. With a current rating of 50 A at 400 V / 40 °C, this Size S0 contactor is an ideal choice for a wide range of industrial applications, including load disconnection and power generation plant integration.

Equipped with a 110 V AC, 50 Hz coil and featuring 1 NO (normally open) + 1 NC (normally closed) auxiliary contacts, the 3RT2327-1AF00 offers versatile control capabilities. Its durable screw terminals ensure secure and straightforward wiring.

Key Features & Benefit

• AC-1 Application Optimized: Specifically engineered for switching non-inductive or weakly inductive loads up to 50 A.
• 4-Pole Design: Provides comprehensive switching for multi-phase systems or applications requiring multiple breaking point.
• 110 V AC Coil (50 Hz): Standard control voltage for easy integration into existing control circuits.
• Integrated Auxiliary Contacts (1 NO + 1 NC): Enhances control flexibility and allows for feedback or interlocking function.
• Robust Screw Terminal: Ensures reliable and secure electrical connection.
• Compact Size S0: Space-efficient design for optimized panel layout.
• High Contact Reliability: Auxiliary contacts are suitable for switching low voltages ($\le 110$ V) and current ($\le 100$ mA), ideal for solid-state circuit.

Overview & Standard

The Siemens 3RT2327-1AF00 contactor adheres to rigorous international standards, including:

• IEC 60947‑1
• IEC 60947‑4‑1
• IEC 60947‑5‑1 (for auxiliary switches)

This commitment to standards ensures high-quality performance, safety, and compatibility within industrial environment.

Protection and Reliability

Protection of Device Connections: All connections on the 3RT2327-1AF00 contactor must be protected against overload and short circuits.

• Main Circuit Protection: For detailed information on protecting a free-standing contactor or device combinations (contactor with overload relay/circuit breaker as motor feeder), refer to the technical product data sheet and Siemens’ Digital and standard Configuration Manuals for load feeders.
• Auxiliary Circuit Protection: Refer to the technical product data sheet for specific recommendations on auxiliary contact protection.
• Control Supply Voltage Protection: Consider relevant standards for control panel configuration, cable dimensioning, and the selection of suitable power supplies with current-limiting functions. Evaluate load characteristics (inrush current, switch-on/holding power) and the need for short-circuit protection for other switching elements in the circuit. Further recommendations for miniature or circuit breakers are available in the “Control panel tip – Selecting and dimensioning suitable power supplies quickly and reliably.”

Protection against Overvoltage: The 3RT23 contactors (like the 3RT2327-1AF00) can be retrofitted with surge suppressors (RC elements, varistors, diodes, or diode assemblies) to dampen opening surges in the coil. These accessories must be ordered separately.

• Note: Damping can increase break times of the contactor and delay times of NO/NC contacts. Consult the Equipment Manual for detailed influence on time response.

Electromagnetic Compatibility (EMC): These contactors meet the requirements for environment category A. When used with frequency converters, refer to the configuration notes in the Equipment Manual.

Contact Reliability of Auxiliary Contacts: The auxiliary contacts of 3RT23 contactors, including the 3RT2327-1AF00, are designed to ensure high contact reliability when switching voltages $\le 110$ V and currents $\le 100$ mA. They are particularly suitable for solid-state circuits with currents $\ge 1$ mA at voltages of 17 V and higher.

Connection Method

• Main Circuit: The 3RT2327-1AF00 (a 3RT232 contactor) utilizes convenient screw terminals.
• Auxiliary and Control Circuit: Features reliable screw terminals for easy wiring.

Application

The Siemens 3RT.3 series contactor, including the 3RT2327-1AF00, are versatile and can be applied for:

• Four-pole switching of weak or non-inductive loads (AC-1)
• Disconnecting loads or power generation plants from the grid
• Transfer switching

For specialized applications involving switching motor-driven loads (AC-3), Siemens also offers specific version of the 3RT23 contactor.

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