Siemens 3RT2326-2AL20 Contactor 4-Pole AC-1, 40A, 230V AC Coil, Spring-Loaded Terminal Original Brand New

Overview

The Siemens 3RT2326-2AL20 is a high-performance 4-pole contactor from the SIRIUS 3RT2 series, specifically designed for AC-1 applications. This compact and reliable S0-size contactor is rated for 40 Amperes at 400 Volts (at 40°C), making it ideal for switching resistive or mildly inductive loads. Featuring a 230 V AC (50/60 Hz) coil and convenient spring-loaded terminals, it offers quick and secure wiring. Integrated 1 NO (normally open) and 1 NC (normally closed) auxiliary contacts provide essential feedback and control possibilities. Built to meet stringent IEC standards, the 3RT2326-2AL20 ensures safe and efficient operation in a wide range of industrial environments.

Function

The Siemens 3RT2326-2AL20 contactor primarily functions as an electrically controlled switch to:

• Four-pole switching of AC-1 loads: Efficiently controls weak or non-inductive loads such as heating elements, lighting systems, or resistive furnaces.
• Disconnecting loads or power generation plants: Provides a reliable means to isolate electrical loads or power sources from the grid.
• Transfer switching: Can be integrated into systems requiring sequential or alternate switching of power paths.

Benefit

• High Reliability: Manufactured to strict IEC standards, ensuring dependable performance and longevity.
• Space-Saving Design: Compact S0 size allows for efficient panel layout and reduced footprint.
• Easy & Fast Wiring: Spring-loaded terminals offer tool-free, vibration-proof connections, reducing installation time and increasing reliability.
• Integrated Auxiliary Contacts: The built-in 1 NO + 1 NC auxiliary contacts provide immediate status feedback and enable interlocking circuits, simplifying control system design.
• Versatile Application: Ideal for a variety of general-purpose switching tasks in industrial and commercial settings where AC-1 performance is required.
• Robust Protection Options: Designed to integrate seamlessly with Siemens SIRIUS protection devices like 3RU2 thermal overload relays or 3RB3 electronic overload relays for comprehensive motor and circuit protection (when used in conjunction with other components).
• Damping Options: Can be retrofitted with surge suppressors (RC elements, varistors, diodes) to protect the coil from opening surges, extending its lifespan.

Technical Details & Consideration

Protection of Device Connections: All connections must be protected against overload and short circuits.

• Main Connections: Refer to the technical product data sheet for free-standing contactor protection. For device combinations (contactor with overload relay or circuit breaker), consult the Digital/Configuration Manual for load feeders.
• Auxiliary Connections: Refer to the technical product data sheet for specific protection information.
• Control Supply Voltage: Protection requires adherence to relevant standards for control panels. Selection of suitable power supplies (e.g., current-limiting) and protection devices (e.g., miniature circuit breakers) is crucial, considering inrush current peaks and holding power.

Protection Against Overvoltage (Control Supply): 3RT23 contactors can be equipped with separately ordered surge suppressors (RC elements, varistors, diodes) to dampen opening surges in the coil. Note that damping increases break times and delays of auxiliary contacts.

Connection Methods:

• Main Circuit (3RT231/3RT232): Screw or spring-loaded terminals; spring-loaded terminals offer convenient plug-in design for device connectors.
• Auxiliary and Control Circuit: Screw terminals.

Electromagnetic Compatibility: The contactors meet environment category A requirements. When used with frequency converters, observe configuration notes in the Equipment Manual.

Contact Reliability of Auxiliary Contacts: For switching voltages $\le 110\text{V}$ and currents $\le 100\text{mA}$, the auxiliary contacts of 3RT contactors ensure high contact reliability, especially suitable for solid-state circuits with currents $\ge 1\text{mA}$ at $17\text{V}$ and higher.

Motor Protection: For overload protection, 3RU2 thermal overload relays or 3RB3 electronic overload relays can be directly mounted onto 3RT23 contactors (e.g., for motor-driven loads if applicable, though this specific contactor is AC-1).

Operating Mechanism: This 3RT23 contactor features a conventional AC operating mechanism. Control is via connections A1-A2.

Replacing Components: The solenoid coil can be replaced. For 3RT233 contactors, contacts can also be replaced; for 3RT2326-2AL20, only the coil is replaceable.

Fitting Auxiliary Contacts: The 3RT232 basic units, including this model, come with two integrated auxiliary contacts (1 NO + 1 NC). Additional auxiliary switches can be mounted, observing permissible configurations (refer to “Auxiliary switches, instantaneous → Overview”).

Accessories and Spare Parts: A wide range of accessories and spare parts are available for SIRIUS 3RT2 contactors and SIRIUS 3RH2 contactor relays. For specific ordering data, refer to the accessories sections.

Application

The Siemens 3RT2326-2AL20 contactor is an excellent choice for:

• Switching non-inductive or weakly inductive loads (AC-1).
• Disconnecting power generation plants or other loads from the grid.
• Use in transfer switching circuits.

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