Siemens 3RT2327-2AC20 Contactor 50A, 4-Pole, 24V AC, Spring-Loaded Terminal, Size S0 Original Brand New

Overview

The Siemens 3RT2327-2AC20 is a robust and reliable 4-pole contactor designed for switching weak or non-inductive loads (AC-1 applications). With a rated current of 50 A at 400 V and 40 °C, this Size S0 contactor features a 24 V AC, 50/60 Hz coil and integrated 1 NO + 1 NC auxiliary contacts. Its spring-loaded terminals ensure fast, secure, and vibration-resistant wiring. Ideal for a wide range of industrial applications, including load disconnection, power generation plant integration, and transfer switching, the 3RT2327-2AC20 adheres to international standards like IEC 60947.

Function

• 4-Pole Switching: Designed for reliable switching of four separate circuits, commonly used in three-phase systems with a neutral or for specific AC-1 applications.
• AC-1 Load Switching: Optimized for switching non-inductive or slightly inductive loads, such as resistance furnaces, heaters, and distribution circuits.
• Integrated Auxiliary Contacts: Features one normally open (NO) and one normally closed (NC) auxiliary contact for feedback, interlocking, and control circuit applications.
• 24V AC Control: Operates with a standard 24 V AC, 50/60 Hz control supply voltage, making it compatible with common control systems.
• Spring-Loaded Terminals: Provides fast, tool-free wiring, exceptional vibration resistance, and consistent contact force, reducing maintenance needs.

Benefit

• Enhanced Safety & Protection: Designed with provisions for short-circuit, overload, and overvoltage protection for main, auxiliary, and control circuits, ensuring reliable and safe operation.
• High Contact Reliability: Auxiliary contacts are specifically engineered for high contact reliability, even at low voltages (≤ 110 V) and currents (≤ 100 mA), making them suitable for solid-state circuits.
• Flexible Application: Suitable for diverse applications including general load switching, disconnecting power generation plants, and transfer switching operations.
• Easy Integration: Compatible with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor protection.
• Robust Construction: Built to withstand demanding industrial environments and conforms to electromagnetic compatibility requirements for environment category A.
• Maintenance Friendly: Spring-loaded terminals simplify installation and reduce wiring time, while the replaceable solenoid coil (for 3RT23 contactors) extends product lifespan.
• Standard Compliance: Meets rigorous international standards, including IEC 60947-1, IEC 60947-4-1, and IEC 60947-5-1, ensuring quality and performance.

Protection of Connections: This contactor requires appropriate external protection for all connections. Refer to the technical product data sheet and relevant configuration manuals for detailed information on short-circuit and overload protection of main, auxiliary, and control supply voltage connections. Overvoltage protection for the control supply voltage connection is possible with separately ordered surge suppressors.

Connection Methods:

• Main Circuit: Spring-loaded terminals with convenient plug-in design.
• Auxiliary & Control Circuit: Spring-loaded terminals.

Electromagnetic Compatibility (EMC): Fulfills requirements for environment category A. When used with frequency converters, specific configuration notes in the Equipment Manual must be observed.

Motor Protection: For overload protection, this 3RT23 contactor can be combined with Siemens 3RU2 thermal overload relays or 3RB3 electronic overload relays.

Operating Mechanism: Features a conventional AC operating mechanism. Solenoid coil replacement is possible.

Auxiliary Contact Expansion: The basic unit includes 1 NO + 1 NC integrated auxiliary contacts and can be expanded with additional auxiliary switches (permissible configuration limits must be observed).

Application

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