7PV datasheet(96/114 Pages) ETC2

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Monitoring Relays

3RN1 Thermistor Motor Protection

For PTC sensors

7/96

Siemens LV 1 T · 2006

■Overview

Thermistor motor protection devices are used for direct

monitoring of the motor winding temperature. For this purpose,

the motors are equipped with temperature-dependent resistors

(PTC) that are directly installed in the motor winding and abruptly

change their resistance at their limit temperature.

■Design

The 3RN1 tripping units are suitable for use in any climate and

finger-safe according to EN 0106 Part 50274. They comply with:

• EN 61000-6-2 and EN 61000-6-4, "Electromagnetic

compatibility of I&C equipment in industrial process

engineering"

• EN 60947-8

The terminals of the auxiliary contacts are designated in

accordance with EN 50005.

The 3RN1 tripping units are suitable for snap-on mounting onto

35 mm standard mounting rails according to EN 50022 or for

screw-mounting using an adapter (Accessories).

Any mounting position is possible.

For devices with the "Manual RESET" function, the test function

can be activated and a trip simulated by pressing the blue

Test/RESET button for longer than 2 seconds.

If a Type A temperature sensor is connected to a Type A tripping

unit, compliance with the operating temperatures is assured (on

pick-up and reset) according to IEC 60034-11-2 (EN 60947-8).

The characteristic curves of the Type A temperature sensors are

described in EN 60947-8, DIN 44081 and DIN 44082.

Use in areas subject to explosion hazard for gases

All devices are approved for Equipment Group II, Category (2)

in Area "G" (areas that contain explosive gases, vapor, spray and

air mixtures).

With PTB 01 ATEX 3218 ex II (2) G, compliance with

guideline 94/9 EG Appendix II is confirmed. The safety devices

must be selected with suitable settings for the safe operation of

motors of the "Increased safety" (EEx e) and "Flameproof

enclosure" (EEx d) degrees of protection and are accessed

outside the area subject to explosion hazard.

PTB 01 ATEX 3218 ex II (2) G

The increased danger in areas subject to explosion hazard

demands careful analysis of the operator's guide, the safety and

commissioning instructions and the standard (EN 60079-14/

VDE 0165) for electronic equipment in areas subject to gas

explosion hazards.

A risk analysis must be performed for the complete plant or

machine. If this risk analysis results in a minimal potential for

danger (Safety Category 1), all 3RN1 TMS tripping units can be

implemented taking into account the safety notes. In the case of

plants or machines with a high potential risk, variants with

integrated short-circuit detection in the sensor circuit are

necessary.

Use in areas subject to explosion hazard for dust

PTB 01 ATEX 3218 ex II (2) G

3RN10 11-.B/-.G, 3RN10 12-.B/-.G and 3RN10 13-...0 tripping

units can be used as safety devices for motors in areas subject

to gas explosion hazard for protection against impermissible

overheating due to overload. If the ATEX marking has the

extension "D:=Dust", these units can also be used as protective

devices for motors in areas subject to dust explosion hazard

(EN 50281-1-1).

Additional information is provided in the EU type test certificate

which can be obtained from the Internet. The units comply with

the requirements of the following classes:

The measuring circuit leads must be routed as separate control

leads. It is not permitted to use cores from the supply line of the

motor or any other main supply cables. If extreme inductive or

capacitive interference is expected as a result of power lines

routed in parallel, shielded control leads must be used.

4000

1330

550

250

-20°C 0

TNF-20

TNF-5

TNF TNF+15 T

NSB00320

TNF+5

Device

Class

3RN10 00, 3RN10 10, 3RN10 11-.C,

3RN10 12-.C, 3RN10 22, 3RN10 62

EN 954-1: Category 1

3RN10 11-.B, 3RN10 11-.G,

3RN10 12-.B, 3RN10 12-.G,

3RN10 13

EN 954-1: Category 2

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