THERMISTOR MONITORING RELAY

Thermistor monitoring relays, in a din rail housing available as SPCO or DPCO. The relays will monitor a series circuit of up to 6 thermistors having a total “healthy” resistance not exceeding 1500 Ohms, the output relay/s 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/s will de-energise, accompanied by the red LED extinguishing. In non latched mode (the link between terminals Y1 & Y2 left open) the relay/s will re-energise when the circuit resistance drops below 1.8 KOhms. In latch mode (the link between terminals Y1 & Y2) the unit can be reset when this closed link is opened, provided the circuit resistance is below 1.8 KOhms. In the event of a short circuit or auxiliary supply loss the unit will de-energise.

As an option the units can be specified with built in reset or test push buttons, or if desired, both. Also available is a Klixon switch input option. However, 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:
SPCO 10Amps/250V AC1
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

YWRTC (Din rail SPCO)
YWR2TC (Din rail DPCO)

KLIXON

*T

OPTIONS

**4
**5
**6

COIL VOLTAGE

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

* Insert T if Klixon version is required

** Insert 4 if Test & Reset buttons are required

** Insert 5 if Reset button is required

** Insert 6 if Test button is required

*** No isolation on DC versions