Product
group
D
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
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