THERMISTOR MONITORING RELAYS (Economical Version)

Thermistor monitoring relays, available in either a din rail or 8 & 11 pin plug in housing SPCO (N/O in the din rail housing). The relays 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. 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 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: Via relay

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
(Din rail version SPNO)

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

YRTC (Din rail SPNO)
8RTC (8 pin SPCO)
11RTC (11 pin SPCO)

KLIXON

*T

COIL VOLTAGE

230VAC
110VAC
48VAC/DC
24VAC/DC

* Insert T if Klixon version is required