SIRIUS 3SE5, 3SE2 mechanical safety switches w. separate actuator

Safety switches with separate actuator are used where the position of doors, covers or protective grilles must be monitored for safety reasons.

3SE5 safety switches with separate actuator have the same enclosures as the 3SE5 position switches (modular system).

3SE5 safety switches with head for separate actuator

Design

Enclosure sizes

The 3SE5 safety switches are available in four different enclosure sizes:

• Plastic enclosure according to EN 50047, 31 mm wide, IP65, 1 cable entry
• Metal enclosures according to EN 50047, 31 mm wide, IP66/IP67, 1 cable entry
• Plastic and metal enclosures according to EN 50041, 40 mm wide, IP66/IP67, 1 cable entry
• Plastic enclosures, 50 mm wide, IP66/IP67, 2 cable entries
• Metal enclosure, 56 mm in wide, IP66/IP67, 3 cable entries

Also available are safety switches in the 3SE2 series which have been developed in this form according to general market requirements:

• Molded-plastic enclosures outside of the standards, enclosure width 52 mm, IP67

Enclosure versions

Various basic versions can be selected for the enclosures of the 3SE5 series:

• Available with 2- or 3-pole contact blocks designed as slow-action contacts
• Optional LED status display
• With mounted 4- or 5-pin M12 device plug, also for connection to field modules, such as SIMATIC ET 200 (available for the wide enclosures as an accessory for self-assembly)
• With 6-pole device plug + PE on the metal enclosures
• Similarly with a combination of plug and LED displays
• AS-Interface version with integrated ASIsafe electronics for all enclosure designs, see SIRIUS 3SF1 mechanical safety switches for AS Interface

For a description of the basic switches, see SIRIUS 3SE5 mechanical position switches.

Operation

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

The actuator heads of the 3SE2243 and 3SE2257 switches with special enclosures cannot be changed. The switches can be approached from the two broad sides and 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.

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

Radius actuators

The safety switches with radius actuators are particularly suitable for rotary protective devices. The movable actuation key allows even small radii to be approached. Damage to the switch and the actuator due to inaccurate approach is prevented.

Locking devices

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

Blocking inserts with padlock

Dust protection

For use in dusty environments, a rubber protective cap is offered that protects the actuator entries of the actuator head from contamination, see Accessories.

Contact reliability

The contact blocks ensure an extremely high contact reliability. This applies even when the devices are switching low voltages and currents.

Positive opening (→)

The NC contacts of the switch are opened reliably by means of a positively-driven actuating plunger mechanism. This is referred to as "positive opening".

The 3SE5 safety switches with separate actuator differ from the previous series through the following new properties:

• All enclosure sizes with increased corrosion protection are optionally available with an LED signaling indicator.
• The 3-pole contact block 1 NO + 2 NC is available for all enclosure sizes.
• The plastic enclosure has simple and fast wiring equipment which makes it possible to save approx. 20 to 25% of the time when connecting.
• The ASIsafe electronics are integrated in the enclosure for the versions with AS‑Interface connection (see 3SF1 safety switches for AS‑Interface); an additional adapter is not required.

Safety switches with separate actuator are used where the position of doors, covers or protective grilles must be monitored for safety reasons.

For more information on protective door monitoring applications, see flyer.

The safety switch can only be operated with the matching coded actuator. Simple overruling by hand or auxiliary devices is impossible.

Devices are available with enclosure versions to suit the particular ambient conditions. The stainless steel actuator is suitable for extreme environmental conditions such as -40 °C. Different control tasks can be performed with the contact blocks best suited for the particular purpose. Dimensions and fixing points of the enclosure are according to EN 50041 or EN 50047 standards.

The devices are suitable for use in any climate.

Standards

The switches comply with IEC 60947‑5‑1 (Electromechanical Control Circuit Devices).

The protective measure of "total insulation" by the plastic enclosure is guaranteed by the use of plastic screw glands.

Safety position switches

For controls according to IEC 60204-1, the devices can be used as a safety position switch. These comply with ISO 14119. A TÜV certificate is available. To secure position switches against changes in their position, positively-driven techniques must be employed on installation.

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 safety switch with separate actuator with (→) if the corresponding fail-safe evaluation units are selected and correctly installed (e.g. the 3SK safety relays or matching units from the ASIsafe, SIMATIC or SINUMERIK product ranges).

If a second 3SE5 safety switch with (→) is used, SIL 3/PL e can be attained.

Application example

Protective door monitoring up to SIL 3/PL e with two 3SE5 position switches using a SIMATIC S7‑1500 fail-safe controller

For a detailed description, see https://support.industry.siemens.com/cs/ww/en/view/21331363.

Evaluation of safety functions

Safety Evaluation in the TIA Selection Tool

The safety evaluation for the IEC 62061 and ISO 13849-1 standards 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 standard-compliant report that can be integrated in the documentation as proof of safety.

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