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Belt Conveyor – Pull Rope Switch HEN 221/231

Resource Industry Solutions Pull Rope Emergency Stop Switch HEN 221-231 SafetyBus


Kiepe pull rope emergency stop switches type HEN 221 and 231 are SafetyBus variants of Kiepe‘s proven bidirectional HEN type pull rope emergency stop switch. They are used in accordance with the requirements of EN 620 as well as BGI 710 and in conformity with DIN EN ISO 13850 as a supplementary safety measures on conveyor belt systems. The pull rope is symmetrical tensioned on both sides of the release lever. The devices are suitable for outdoor use and applications where the temperature varies considerably.

With the pull rope system functionally aligned, the emergency stop signal can be triggered over a distance of up to about 100 m for each switch.

The emergency stop signal is transferred by a SafetyBus module 100 over a 2-wire bus to a safety relay. Signal transfers can be economically implemented over long distances.

Kiepe pullrope emergency stop switches type HEN 221 and HEN 231 comply with the Machinery Directive 2006/42/EC.

They must only be used in combination with Dupline® safety relays in control circuits and require a Dupline® bus signal produced by a channel generator. (

Types HEN 221 and HEN 231 are equipped with a positive making normal close contact that returns the input signal for the SafetyBus.

Taking into consideration the safety data and maintenance recommendations, the pull rope emergency stop switches type HEN can be used with the SafetyBus module in safety circuits in accordance with DIN EN ISO 13849 up to performance level e (PL e).


The pull rope emergency stop switch is actuated by a pull rope connected on both sides of the red trigger lever. The contacts are actuated by a spring supported cam disc (snap action function). The emergency stop signal is generated by a positive making NC contact that changes the state of the SafetyBus module 100.

Each SafetyBus module 100 receives its clocked and synchronized electrical supply, assigned to two addresses, via the digital pulse code of a channel generator.

The addressed signals are required for the safety query via a safety relay. The safety relay detects errors on the bus, inconsistencies in signal generation and signal change.

SafetyBus modules 100 and safety relays must be coordinated and programmed before installation.

After an emergency stop has been triggered, the switching mechanism is locked in the shut-off position „0“.

When the reset lever is actuated in switch position „1“, the switching contact is closed again and the bus module enables the safety relay again.

Resetting the pull rope emergency stop switch must not cause the conveyor system to start up.


Designation: Pull-rope emergency stop switch type HEN 221 / 231 – Emergency stop device with latching function; SafetyBus design.

Type of actuation:Bidirectional (pull rope on both sides of the switch); Spring-supported („snap action“)

Complies with:DIN EN ISO 13850; DIN EN 60204-1; DIN EN 60947-5-5; DIN EN 60947-5-1; EN 620; BGI 710

Suited for: Control units and systems in accordance with DIN EN 60204


Enclosure: Aluminum GK-AISi 12

Finish: DD Paint, Enclosure – yellow (RAL 1004), trigger lever – red (RAL 3000), reset lever – blue (RAL 5010)

Mounting: 2 slotted holes for M8 screws.

Installation position: Horizontal, tilt angle up to about 15°.

Pull-rope length, approved: Up to about 100 m.

Actuation force: 30 N ± 10 N

Weight: 1.8 kg.

Electrical System

Switching system:1 positive making gold plated NC switch contact Signal transfer via Dupline® SafetyBus module.

Cable entry: Threaded holes 2x M25 x 1.5 with each 1x screwed cable gland: sealing area Ø 11 mm to Ø 16 mm; 1x dummy screw.

Connection cross section:max 2.5 mm2.

Protective conductor connection: In the casing; M4

Contact reliability:220,000 operations

Ambient conditions in accordance with DIN EN 60947-5-5

Ambient temperature Protection: -25°C.. + 70°C

Protection Rating: IP 67 in accordance with EN 60529

Safety data in accordance with DIN EN ISO 13849 and EN 61062

Safety functions: Emergency stop incl. latching. Manual reset.

B10d-value: 24.000 actuation’s


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