HAGER CONTACTOR 40A

Here’s a product specification for a HAGER 40 A contactor — an electrically-operated switch used to remotely control and switch electrical loads like motors, lighting, pumps, HVAC, and other power circuits in panels.

What These Specs Mean

• Rated Current (40 A): The contactor’s main contacts can carry up to 40 A of continuous load current in general switching applications.

• Control Coil Voltage: The coil (control input) is usually 230 V AC — meaning you energize the contactor with standard mains control wiring (from a switch, relay, PLC, etc.).

• Contact Configuration:
  • NO (Normally Open): Contact closes when the coil is energized.
  • NC (Normally Closed): Contact opens when the coil is energized.
  • Mixed (NO + NC): Useful for both power switching and control feedback logic.

• AC3 Rating: This tells you how much load (especially for motors) the contactor can safely switch under inductive load conditions. For a 40 A contactor, the AC3 rating is typically ~25 A — suitable for many small motor loads.

• Mechanical / Electrical Life: These specify how many times the contactor can operate under no load (mechanical) and under electrical load before it’s likely worn out.

 Common HAGER 40 A Contactor Models

Standard 40 A Contactors

• Hager Contactor 40 A 2NO 230 V (ESC240) — basic two-pole power switching.

• Hager Contactor 40 A 4NO 230 V (ESC440) — four normally-open contacts for controlling multiple circuits.

• Hager Contactor 40 A 3S 230 V (ESC340S) — alternative 40 A contactor variant with a specific switching arrangement.

• Hager Contactor 40 A 4NC 230 V (ESC441) — four normally-closed contacts for logic/inverse switching requirements.

• Hager 40 A 2NO+2NC Contactors (ESC442) — mixed contact types for flexible control uses.

Typical Uses

Switching three-phase loads like fans, pumps, compressors
Motor control (start/stop) in automation panels
Lighting control (large lighting banks)
HVAC systems (air conditioners, chillers)
Remote control via timers, PLC output, switches

How It Works (Simple)

1. Control voltage applied to the coil (e.g., 230 V AC).

2. The coil generates an electromagnetic field that pulls in the contacts.

3. The main power contacts close, allowing current to flow to the load.

4. When the coil is de-energized, the contacts open and interrupt the circuit.

Tip: A contactor switches the load but doesn’t provide protective functions by itself (such as overload or earth-leakage protection). It’s best used with MCBs, RCBOs, or overload relays for complete circuit safety.