THERMISTOR MONITORING RELAY WITH BUILT IN “NO VOLT SAFE LATCH” PLUS MANUAL & REMOTE RESET

Thermistor monitoring relay, din rail mounted and DPCO output. The relay will monitor a series circuit of up to 6 thermistors having a total “healthy” resistance not exceeding 1500 Ohms, the output relay will be energised indicated also by a red LED. Should overheating occur the individual resistance of a thermistor will rapidly rise above 3.3 KOhms at which point the normally energised relay will de-energise, accompanied by the red LED extinguishing, at which point the relay will be “latched off”. In this latched condition the YWR2TC7 will not reset when the thermistor cools down and will not be reset by removing and re-applying the auxiliary supply. In order to reset the YWR2TC7 the auxiliary supply must be on, the thermistors cold, then the front reset button can be operated or the remote reset input activated to reenergise the relay. In normal “no fault” operation the relay will energise on the connection of the auxiliary supply. Newly installed units may need to be initially reset on commissioning, transit shock can cause the relay to latch over.

Also available is a Klixon switch input option, short circuit protection is omitted on versions for use with Klixon switches.

Supply & Measuring:

Nominal supply tolerance: ±15%

Isolation AC versions: Via transformer

Isolation DC versions: None

Operating level: 3.3 KOhms ±5%

Reset level: 1.8 KOhms ±10%

Max cold resistance of detection circuit: 1.5 KOhms

Max No. of PTC sensors: 6

Sensor voltage: 2.5V DC max

Short circuit detection: 30 Ohms ±20%

Operation delay on thermistor operation: 0.5 sec

Relay output:

Output contacts: DPCO 8Amps/250V AC1

Mechanical life: 30 Million ops

Electrical life: 200K ops at max rated load

General:

Operating temperature: -20°C to +65°C

Storage temperature: -20°C to +65°C

Max cable size: 4mm

CE marked: Yes

In accordance with:
EN61000-6-1: 2007
EN61000-6-3: 2007
EN61010-1: 2002

Housing material: Polycarbonate, Auto extinguishable to UL 94 V-0

TYPE

YWR2TC7

KLIXON

*T

COIL VOLTAGE

440VAC
415VAC
400VAC
380VAC
230VAC
110VAC
48VAC
24VAC
**48VDC
**24VDC
**12VDC

* Insert T if Klixon version is required

** No isolation on DC versions