3SE2120-1GW

What type of device is this?

It is a metal-enclosed mechanical position switch used to detect the position or movement of machine parts, guards, cams or actuating surfaces in industrial control applications.

What contact configuration does it use?

The switch uses a 1NO + 1NC contact arrangement, giving one normally open and one normally closed contact for control circuit integration.

What does snap-action contact operation mean?

Snap-action operation means the contacts change state quickly once the actuation point is reached, helping provide a clear and repeatable switching response.

What type of actuator is fitted?

This position switch is equipped with a roller crank twist lever with fine adjustment, allowing the lever position to be set in small increments to suit the installation.

Is the actuator head standardised?

Yes. The actuator head follows EN 50041 design A, which is a common industrial format for position switches of this style.

What enclosure material is used?

The enclosure is made from painted metal, giving the unit a robust construction suitable for demanding industrial environments.

What ingress protection rating does it have?

The device is rated IP67, meaning it is designed to resist dust ingress and temporary immersion in water under defined test conditions.

How is the device connected electrically?

Electrical connection is made using screw-type terminals, which are commonly used for secure field wiring in industrial control panels and machinery.

How is it mounted?

The switch is designed for screw fixing, allowing it to be mounted directly to a machine frame, bracket or suitable mechanical surface.

What operating temperature range is specified?

The specified operating temperature range is -30 °C to +85 °C, making it suitable for a broad range of industrial environments.

What cable entry does the housing use?

The housing includes an M20 x 1.5 cable entry, a widely used thread size for industrial cable glands and conduit fittings.

What are the approximate physical dimensions?

The listed dimensions are approximately 40 x 60 x 131 mm, making it a compact position switch for machine-mounted applications.

What is positive opening used for?

Positive opening provides a direct mechanical action to open the normally closed contact when actuated, which can be important in machinery control circuits where defined contact separation is required.

What kinds of applications is this switch typically used in?

It is typically used for end-position detection, machine guarding position monitoring, conveyor equipment, handling systems, packaging machinery and other automation tasks where a mechanical position signal is needed.

Is it suitable for direct connection to a communication network?

No. The device has no communication interface; it is intended to be wired into a control circuit through its electromechanical contacts.