3SF1 mechanical safety switches with tumbler

The 3SF1 safety switches with safety-related communication can be directly connected using the AS‑Interface bus system. The safety functions no longer have to be wired up conventionally.

With the 3SF1 safety switches the ASIsafe electronics are integrated in the switch enclosure.

3SF1 safety switch with tumbler and with integrated ASIsafe electronics

Operation

The actuator head is included in the scope of supply. For actuation from four directions it can be adjusted through 4 x 90°. The switches can also be approached from above.

The actuator is not included in the scope of supply of the safety switches and must be ordered separately from a choice of different versions to suit the application, see Accessories ordering data for the relevant safety switch.

The actuator is encoded. Simple overruling by hand or auxiliary devices is impossible.

Locking devices

A high-grade steel blocking insert for attaching up to eight padlocks is available for even more safety, see Accessories ordering data for the relevant safety switch.

Dust protection

For use of the enclosures in dusty environments, a rubber protective cap is offered that protects the actuator entries of the actuator head from contamination, see Accessories ordering data for the relevant safety switch.

Tumbler

There are two versions for interlocking the actuator:

• Spring-actuated lock (closed-circuit principle) with various release mechanisms
• Solenoid-locked (open-circuit principle)

For more explanations, see SIRIUS 3SE5, 3SE2 mechanical position switches with tumbler.

Display

The switches have a status display with four LEDs:

• LED 1 (green): AS‑i
• LED 2 (red): FAULT
• LED 3 (yellow): F‑IN1
• LED 4 (yellow): F‑IN2

Connection

Connection to the AS-Interface is by means of a 4-pin M12 device plug (plastic version) connected to the yellow AS-Interface bus cable (no additional supply of auxiliary power is required thanks to the low current consumption of the solenoid of max. 170 mA).

The 3SF13 safety switches with tumbler offer:

• More safety through higher locking forces:
  • 1 300 N for the plastic version
  • 2 600 N for the metal version
• Various release mechanisms: lock release, escape release and emergency release
• ASIsafe electronics integrated in the enclosure; connected through 4-pole M12 device plug
• Current consumption of the solenoid no more than 170 mA
• Two contact blocks as standard equipment, hence fewer versions needed
• Same dimensions for all enclosure versions: plastic, metal
• An extensive range of actuators
• Status display with four LEDs
• 3SF1324‑1S.21‑1BK4 series with high degree of protection IP69 in accordance with IEC 60529, cover with foamed seal

The safety switches with tumbler are exceptional safety-related devices which prevent an unforeseen or intentional opening of protective doors, protective grilles or other covers as long as a dangerous situation is present (i.e. follow-on motion of the switched-off machine).

The safety switches with tumbler have the following functions:

• Enabling the machine or process with closed and locked protective device
• Locking the machine or process with opened protective device
• Position monitoring of the protective device and tumbler

Standards

The switches comply with IEC 60947‑1 (Low-Voltage Controlgear, General) and IEC 60947‑5‑1 (Electromechanical Control Circuit Devices).

The mechanical design of the switch corresponds to the requirements of the fail-safe principle according to ISO 14119.

Approvals

AS-Interface according to IEC 62026‑2

The switches are approved for use with locking devices according to ISO 14119 and ISO 12100.

3SF13 safety switches with tumbler have a VDE test mark.

The 3SF1 safety switches are approved according to UL 508, UL 50 and UL 746‑C.

Application example

EMERGENCY STOP shutdown and protective door monitoring with a 3SF1 safety switch with tumbler and AS‑Interface in the SIMATIC ET 200SP

For a detailed description, see https://support.industry.siemens.com/cs/ww/en/view/109769506.

Safety circuits

Standard IEC 60947‑5‑1 requires positive opening of the NC contacts. In other words, for the purposes of personal safety, the assured opening of NC contacts is expressly stipulated for the electrical equipment of machines in all safety circuits and marked in accordance with the standard IEC 60947‑5‑1 with the symbol (→).

SIL 2 according to IEC 62061/IEC 61508 or PL d according to ISO 13849‑1 can be attained with a 3SF13 safety switch with (→) if the corresponding fail-safe evaluation units are selected from the ASIsafe product range and correctly installed.

If a second 3SF1 safety switch with (→) is used, SIL 3/PL e can be attained.

Evaluation of safety functions

Safety Evaluation in the TIA Selection Tool

The safety evaluation for the standards IEC 62061 and ISO 13849‑1 is performed quickly and easily, directly in the TIA Selection Tool. In addition to the fast and safe calculation of machine safety functions – from the definition of the system structure to the selection of components – this enables shared data management during all project phases. Take the next step in the digital design of machinery and equipment with Safety Evaluation in the TIA Selection Tool.

In addition, the functionalities of the proven Safety Evaluation Tool are still available. It determines the achieved safety integrity (SIL/PL) step-by-step. You receive the results as a standards-compliant report that can be integrated in the documentation as proof of safety.

For more information, see www.siemens.com/safety-evaluation-tool.