REL EX

Features

The REL EX limit switches are used to monitor the end position of moving machine parts. With at least two switching points, a signal can be used for a pre-warning.The REL EX limit switches are suitable for use in transportation, conveying, loading and mixing systems for heavy bulk materials and are intended for use in fixed installations in a salty atmosphere. In the installation position, they are triggerd from one side. (Variants with end position detection on both sides on request)The KIEPE limit switches Type REL EX are suited for use in explosive atmosphere with conductive dust, Group II, category 2 , in zone 21 and 22 (Type REL EX 2D) or categorie 3, only in zone 22 (Type REL EX 3D).The Kiepe limit switch Type REL EX complies with the ATEX Directive 2014/34/EU and meets the safety objectives of the Low Vol-tage Directive 2014/35/EU and IECEx.The switch Type REL EX features a robust cast iron housing and is equipped with up to 4 force-actuated changeover contacts with snap-action function with two settable switching points.

Note: The limit switch must only be used in electrical control circuits.

Corrosive

Powder
Gravel
Rubble

Non-Corrosive

Powder
Gravel
Rubble

The limit switch type REL EX operates when the actuating roller is approached and deflected by the machine part in the direction of rotation of the roller lever. The switching angle can be set for each switching contact by means of an adjustable cam roller.In addition to the safety cut-out, this also enables an advance warning to be realized. When the machine part is reset, the roller lever returns automatically.

Designation	Limit Switch Type REL EX
Type of actuation	Bidirectional (double-side) via roller lever
Complies with	EN 60947-5-1; EN IEC 60079-31; (EN IEC 60079-0)
Suited for	Control units in accordance with DIN EN 60204-1

General

Device group / device category	II / 2D, 3D; flammable, conductive dust
Type of protection	Protection through housing
for Zone 21, 22 REL EX II 2D	II 2D Ex tb IIIC T85°C Db IP67
for Zone 22 REL EX II 3D	II 3D Ex tc IIIC T85°C Dc IP67
Certificates	EPS 12 ATEX 1 479 X, IECEx EPS 14.0040X

ATEX/IECEx

Enclosure	Cast iron
Coating	PU 2K-paint; Enclosure – yellow (RAL 1004)
Actuating lever	Stainless stell, Roller: brass
Deflection of roller lever (max.)	2 x M10
Mounting	+/- 75°
Weight	4.5 kg

Mechanics

Switching system (max.)	4 SPDT (snap action) positive-opening switches
Switching range	2x 12,5°, adjustable +/-10° 2x 18°, fix
Cable entry (included in scope of delivery)	2 x M25 x 1,5 with red transport lock 1x screwed cable gland: sealing area ∅ 10 mm to ∅ 17 mm; 1x dummy screw
Utilization category	AC-15: 230V ; 1,5A DC-13: 60V; 0,5A DC-13: 24V; 2A
Connection cross section (max.)	2,5 mm2
Protective conductor connection	Protection Class I / protective earthing
Potential equalization connection	Enclosure / Cover
Rated insulation voltage Ui	250 V
Rated impulse withstand voltage Uimp	2.5 kV, Overvoltage category II, degree of polution 3
Conventional thermal current Ith	6A

Electrical system

Permissible ambient temperature	–25 °C …+70 °C
Protection rating (according to EN 60529)	IP67

Ambient conditions according to DIN EN 60947-5-5

Contact reliability at AC-15 230V, 1.5 A	>30.000 operations bei 100% Ie

Reliability

The limit switch REL EX 1 is fastened to a substructure with 2 M8 screws each. It can be mounted on the ends of transport systems. Devices on the transport trolleys actuate the limit switches upon reaching the end of the transport path. (Recommended geometry of the approach setting max. 45°3 )The roller lever is interchangeable and can be freely fixed on the switch axis. The switching points are cam-controlled and adjustable. 2 The electrical connection is made when the device is open via the cable gland included in the scope of delivery directly to the connection glands of the switching elements.

Hinweis: The red transport locks must be completely removed and replaced with the supplied screw plugs.For protection against electrostatic discharge REL EX is provided with conductive compounds and external potential equalization connections, to which a minimum of 4 mm2 potential equalization cable must be connected directly to the system. All connections must be checked regularly in accordance with the operation instructions.