Page 159 - EPR Catalog 2015

Thermistor motor protection relays
Technical data

Technical data CM-MSS.x1 CM-MSS.x2 CM-MSS.x3
Data at Ta = 25 °C and rated values, unless otherwise indicated

Supply circuit - Input circuit

Rated control supply voltage Us A1-A2 24-240 V AC/DC 24 V AC/DC 220-240 V AC 2
A2-A3 - - 110-130 V AC

Rated control supply voltage Us tolerance -15...+10 % 50-60 Hz yes
Rated frequency 15-400 Hz no

Electrical insulation between supply circuit and measuring circuit yes

Power failure buffering time 20 ms

Supply circuit - Measuring circuit / Sensor circuit

Number of circuits 1 (CM-MSS.51: 2)
Sensor type PTC type A (DIN/EN 44081, DIN/EN 44082)
Max. total resistance of sensors connected in series, cold state
< 750 :

Overtemperature switch-off resistance (relay de-energizes) 2.83 k: Ȁ 1% (CM-MSS.12 /.13 /.22 /.23: 2.7 k: Ȁ 5%)
monitoring switch-on resistance (relay energizes) 1.1 k: Ȁ 1% (CM-MSS.12 /.13 /.22 /.23: 1.2 k: Ȁ 5%)

Maximum voltage in sensor circuit 1.33 k: 2.5 V

4 k: 3.7 V

ȍ k: 5.5 V

Maximum current in sensor circuit 3.7 mA

Maximum sensor cable length 2 x 100 m at 0.75 mm2, 2 x 400 m at 2.5 mm2

Accuracy within the rated control supply voltage tolerance 0.50 % (CM-MSS.12 /.13 /.22 /.23: 5 %)

Accuracy within the temperature range 0.01 %/K (CM-MSS.12 /.13 /.22 /.23: 0.5 %/K)

Repeat accuracy (constant parameters) on request

Reaction time of the safety function < 100 ms

Hardware fault tolerance (HFT) 0

Control circuit

Control function see „Selection table CM-MSx range“ on page 89
Maximum no-load voltage 5.5 V
Max. current 0.6 mA (CM-MSS.12 /.13 /.22 /.23: 1.2 mA)
Maximum cable length 2 x 100 m at 0.75 mm², 2 x 400 m at 2.5 mm²
Indication of operational states
Control supply voltage U LED green
Relay status R LED yellow
Fault message F LED red

Output circuit

Kind of output see „Selection table CM-MSx range“ on page 89

Operating principle closed-circuit principle

Contact material AgNi alloy, Cd free

Rated operational voltage Ue (IEC/EN 60947-1) 250 V AC
Minimum switching voltage / Minimum switching current 24 V / 10 mA

Maximum switching voltage / Maximum switching current see data sheet

Rated operating current Ie AC-12 (resistive) at 230 V 4 A
(IEC/EN 60947-5-1) AC-15 (inductive) at 230 V 3 A

DC-12 (resistive) at 24 V 4 A

DC-13 (inductive) at 24 V 2 A

AC Rating (UL 508) utilization category (Control Circuit Rating Code) B 300

maximum rated operational voltage 250 V AC

maximum continuous thermal current at B 300 4 A

maximum making/breaking apparent power at B 300 3600/360 VA

Mechanical lifetime 30 x 106 switching cycles

Electrical lifetime at AC12, 230 V AC, 4 A 0.1 x 106 switching cycles

Maximum fuse rating to achieve short-circuit n/c contact 10 A fast-acting (CM-MSS.12, CM-MSS.13, CM-MSS.51: 6 A)
protection n/o contact 10 A fast-acting

2CDC 110 004 C0210 | Catalog Electronic Products and Relays 2015 | ABB 2/92