Dorby Czas MMR17-RTA-M048 Technical data

Temperature Monitoring Relay

MMR17-RTA-M048-108

Technical Data

Description

Output circuit

Contact arrangement

1CO

Rated/max contact voltage

V AC

250/400

Switching current In in category AC1 DC1

A/V AC A/V DC

8/250

8/24

Switching load range AC1

2 000

Contact resistance

mΩ

≤ 100

Maximum rated current

Input circuit

Input contacts A1, A2, A3

Rated supply voltage Un

A1-A2: 48VAC (50/60Hz)

A1-A3: 24VACDC (50/60Hz)

Supply voltage tolerance

 supply 48VAC  supply 24VACDC

0,8…1,15Un (38,4…55,2V) 0,85…1,2Un (20,4…28,8V)

Rated consumption

 supply 48VAC  supply 24VDC

≤ 1

≤ 0,5W

Rated frequency AC

47…63

Rated surge voltage V 1 000

Burst voltage V 2 000

Insulation

Insulation rated voltage

V AC

250

Rated surge voltage

4 000 1,2/50s

Overvoltage category III

Pollution degree 2

Flammability pcb: V0, housing: HB

Dielectric strength

 input - output  open contact

V AC 4 000

1 000

Measurement circuit

Response value > T

max

> 3300

Release value Ω 110 < R < 1800

Max PTC resistance in when cold

1500

PTC short circuit resistance

< 70

PTC galvanic isolation no

Tolerance % 5

PTC sensors type PTC, Sign A

Delay circuit

ON/OFF delay

~ 0,5

General data

Electrical life AC1 at 1000 VA resistive load

cycles

≥ 1,5 x 105

Mechanical life

cycles

≥ 1 x 107

Dimensions (a x b x h) / Weight

mm / g

90 x 17,5 x 66 / 52

Storage / ambient temperature

ºC

-40…+70 / -20…+45

IP rating IP20

Relative humidity % 85

Shock resistance g 15

Vibration resistance

0,35 10…55Hz

Indicators 2 LED diodes

Temperature Monitoring Relay is designed for application in automation and control systems to protect devices (i.e. motors) against temperature rise above the limit.

Two LED diodes indicate state of the relay. Green LED diode indicates the presence of supply voltage. If the temperature of the monitoring unit exceeds the limit, when resistance of PTC circuit is higher than 3300Ω, the contact is opened and the red LED diode flashes. The relay is released when the resistance of PTC sensors drops below 1800Ω. When the PTC resistance is lower than 70Ω the short circuit is detected, the contact is opened and the red LED diode illuminates steadily.

Caution!!!

Input of the PTC sensor is not galvanically isolated from the input circuit. When powering from 48VAC mains, dangerous voltage can appear on PTC T1 and T2 inputs posing danger of electric shock, so PTC sensors must provide galvanic isolation between the PTC circuit and the monitoring device. The hazard does not exist when the monitoring relay is powered from 24VACDC voltage.

Mounting

1. Mounted on DIN-rail TS 35 according to EN

60715.

2. Mounting position: any.

3. IP Rating IP20.

4. Tightening torque: max. 1 Nm.

5. Terminal capacity: 1 x 0.5 to 2.5 mm²

with/without multicore cable end 1 x 4 mm2 without multicore cable end 2 x 0.5 to

1.5 mm² with/without multicore cable end

2 x 2.5 mm2 flexible without multicore cable end.

Danger!

Ordering information

Read and understand these instructions before installing, operating or maintaining the equipment. Never carry out work on live parts! Danger of fatal injury! The product must not be used in case of obvious damage. To be installed by an authorized person.

MMR17-RTA-M048-108

 Temperature Monitoring Relay of the motor winding  Up to 6 PTC thermistor sensors  Overheat detection  Short circuit monitoring of the PTC line  Supply voltage 48VAC or 24VACDC  In accordance with PN-EN 60730-1, PN-EN 60947-8A

MMR17-3141 v1.0

Temperature Monitoring Relay

MMR17-RTA-M048-108

Dobry Czas Sp. z o.o. 51-315 Wrocław ul. Miłostowska 7/6

 +48 71 729 95 90  marketing@dobry-czas.pl

www.dobry-czas.pl

Monitoring function

Dimensions

Connection diagram

For 24VACDC mains, the supply voltage connect between A1 and A3 (polarity is irrelevant).

Maximum 6 PTC sensors connect in series between T1 and T2 inputs.

RT – if the PTC resistance is above 80Ω the output relay switches into ON position. When the cumulative resistance of the PTC circuit exceeds 3300Ω (at least one of the PTCs has reached the cut-off temperature), the output relay switches into OFF position and the red LED flashes. The output relay switches into ON position, if the cumulative resistance drops below 1800Ω by cooling down of the PTC. In case of PTC short circuit detection (<70Ω) the output relay switches into OFF position and red LED illuminates steadily.

MMR17-3141 v1.0