Pilz S1MS Data Sheet

Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

The thermistor monitoring relay S1MS is used as a protection device in temperature moni­toring circuits in accordance with EN 44081. It protects motors, generators, storage areas,
etc. from overheating.

Unit features

} Relay outputs:

2 auxiliary contacts (C/O)

} Measuring circuit for connecting a temperature sensor (PTC resistor)

} automatic reset

} LED as supply voltage indicator

} LED as fault indicator

Unit description

The thermistor monitoring relay is enclosed in an S-95 slimline housing. There are 5 ver­sions available for AC operation and one for AC and DC operation.

A temperature sensor is connected to the S1MS measuring circuit. If the temperature ex­ceeds a defined value, i.e. the resistance of the temperature sensor reaches the response
value, the output contacts switch.

Contacts 11-14 and 21-24 open, contacts 11-12 and 21-22 close. If the temperature then
falls again, i.e. the resistance of the temperature sensor reaches the release value, the aux­iliary contacts automatically switch again. The unit is ready for operation.

Safety features

The unit meets the following safety requirements:

} Operates to normally energised mode

} Protection of the monitored unit is maintained in the following cases:

– Power failure

– Coil defect

– Open circuit

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Internal wiring diagram

Measuring circuit

* Insulation between the non-marked area and the relay contacts: Basic insulation (over­voltage category III), safe separation (overvoltage category II)

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Timing diagram

11 - 14

+

21-24

Legend:

} U

Supply voltage

B

} R

} R

} R

Response value

on

Release value

off

PTC resistor

th

Connection example

cannot be stored

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Terminal configuration

Installation

} The unit should be installed in a control cabinet with a protection type of at least IP54.

} Use the notch on the rear of the unit to attach it to a DIN rail.

} Ensure the unit is mounted securely on a vertical DIN rail (35 mm) by using a fixing ele-

ment (e.g. retaining bracket or an end angle).

Dimensions

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

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

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Technical details

Order no. 840775, 840725, 840740

See below for more order numbers

General 840725 840740 840775
Approvals CCC, CE, cULus Listed CCC, CE, cULus Listed CCC, CE, cULus Listed

Electrical data 840725 840740 840775

Supply voltage

Voltage 48 V 110 V 24 V
Type AC AC AC/DC
Voltage tolerance -15 %/+10 % -15 %/+10 % -15 %/+10 %
Output of external pow-

er supply (AC) 3,5 VA 3,5 VA 3,5 VA
Output of external pow-

er supply (DC) – – 2,0 W

Frequency range AC 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Max. inrush current at UB 10,00 A 10,00 A 10,00 A
Continuous duty 100 % 100 % 100 %
Min. unit fuse protection 1,00 A 1,00 A 1,00 A
Max. unit fuse protection F1Max. conductor cross

section

Measuring circuit 840725 840740 840775

Response value Ron 3,6 kOhm, ±10 % 3,6 kOhm, ±10 % 3,6 kOhm, ±10 %
Release value Rab 1,8 kOhm, ±10 % 1,8 kOhm, ±10 % 1,8 kOhm, ±10 %
Cold resistance at 20 °C 1,5 kOhm 1,5 kOhm 1,5 kOhm

Relay outputs 840725 840740 840775

Utilisation category

In accordance with the

standard EN 60947-4-1 EN 60947-4-1 EN 60947-4-1

Auxiliary contacts, AC1

at 240 V 240 V 240 V

Min. current 0,10 A 0,10 A 0,10 A

Max. current 5,0 A 5,0 A 5,0 A

Max. power 1200 VA 1200 VA 1200 VA

Auxiliary contacts, DC1

at 24 V 24 V 24 V

Min. current 0,10 A 0,10 A 0,10 A

Max. current 5,0 A 5,0 A 5,0 A

Max. power 120 W 120 W 120 W

Max. conductor cross
section

Max. conductor cross
section

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Relay outputs 840725 840740 840775

Utilisation category

In accordance with the

standard EN 60947-5-1 EN 60947-5-1 EN 60947-5-1

Auxiliary contacts,

AC15 at 230 V 230 V 230 V

Max. current 2,0 A 2,0 A 2,0 A

Auxiliary contacts,

DC13 (6 cycles/min) at 24 V 24 V 24 V

Max. current 1,5 A 1,5 A 1,5 A
Contact fuse protection,

external auxiliary contacts

Blow-out fuse, quick 6 A 6 A 6 A

Blow-out fuse, slow 4 A 4 A 4 A

Circuit breaker, 24

V AC/DC, characteristic

B/C 4 A 4 A 4 A
Contact material AgCdO + 3,0 µm Au AgCdO + 3,0 µm Au AgCdO + 3,0 µm Au

Times 840725 840740 840775

Switch-on delay

Typ. switch-on delay 350 ms 350 ms 350 ms

Environmental data 840725 840740 840775

Climatic suitability EN 60068-2-78 EN 60068-2-78 EN 60068-2-78
Ambient temperature

Temperature range -10 - 55 °C -10 - 55 °C -10 - 55 °C
Storage temperature

Temperature range -40 - 85 °C -40 - 85 °C -40 - 85 °C
EMC EN 60947-5-1, EN 61000-

6-2

Vibration

In accordance with the

standard EN 60068-2-6 EN 60068-2-6 EN 60068-2-6

Frequency 10,0 - 55,0 Hz 10,0 - 55,0 Hz 10,0 - 55,0 Hz

Amplitude 0,35 mm 0,35 mm 0,35 mm
Airgap creepage

In accordance with the

standard EN 60947-1 EN 60947-1 EN 60947-1

Overvoltage category III / II III / II III / II

Pollution degree 2 2 2
Rated insulation voltage 250 V 250 V 250 V
Rated impulse withstand

voltage 4,00 kV 4,00 kV 4,00 kV

EN 60947-5-1, EN 61000­6-2

EN 60947-5-1, EN 61000­6-2

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Environmental data 840725 840740 840775

Protection type

Mounting (e.g. cabinet) IP54 IP54 IP54

Housing IP40 IP40 IP40

Terminals IP20 IP20 IP20

Mechanical data 840725 840740 840775

Mounting position Any Any Any
Mechanical life 10,000,000 cycles 10,000,000 cycles 10,000,000 cycles
Material

Bottom PPO UL 94 V0 PPO UL 94 V0 PPO UL 94 V0

Front ABS UL 94 V0 ABS UL 94 V0 ABS UL 94 V0

Top PPO UL 94 V0 PPO UL 94 V0 PPO UL 94 V0
Conductor cross section

with screw terminals

1 core flexible 0,20 - 4,00 mm², 24 - 10

AWG

2 core with the same

cross section, flexible

with crimp connectors,

no plastic sleeve

2 core with the same

cross section, flexible

without crimp connec-

tors or with TWIN crimp

connectors
Torque setting with screw

terminals 0,60 Nm 0,60 Nm 0,60 Nm
Connection type Screw terminal Screw terminal Screw terminal
Mounting type Fixed Fixed Fixed
Dimensions

Height 87,0 mm 87,0 mm 87,0 mm

Width 22,5 mm 22,5 mm 22,5 mm

Depth 121,0 mm 121,0 mm 121,0 mm
Weight 160 g 160 g 120 g

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 4,00 mm², 24 - 10
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 4,00 mm², 24 - 10
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 2,50 mm², 24 - 14
AWG

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Order no. 840760, 840765, 839770

General 839770 840760 840765
Approvals CCC, CE CCC, CE, cULus Listed CCC, CE, cULus Listed

Electrical data 839770 840760 840765

Supply voltage

Voltage 400 V 230 V 240 V

Type AC AC AC

Voltage tolerance -15 %/+10 % -15 %/+10 % -15 %/+10 %

Output of external pow-

er supply (AC) 3,5 VA 3,5 VA 3,5 VA

Frequency range AC 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Max. inrush current at UB 10,00 A 10,00 A 10,00 A
Continuous duty 100 % 100 % 100 %
Min. unit fuse protection 1,00 A 1,00 A 1,00 A
Max. unit fuse protection F1Max. conductor cross

section

Measuring circuit 839770 840760 840765

Response value Ron 3,6 kOhm, ±10 % 3,6 kOhm, ±10 % 3,6 kOhm, ±10 %
Release value Rab 1,8 kOhm, ±10 % 1,8 kOhm, ±10 % 1,8 kOhm, ±10 %
Cold resistance at 20 °C 1,5 kOhm 1,5 kOhm 1,5 kOhm

Relay outputs 839770 840760 840765

Utilisation category

In accordance with the

standard EN 60947-4-1 EN 60947-4-1 EN 60947-4-1

Auxiliary contacts, AC1

at 240 V 240 V 240 V

Min. current 0,10 A 0,10 A 0,10 A

Max. current 5,0 A 5,0 A 5,0 A

Max. power 1200 VA 1200 VA 1200 VA

Auxiliary contacts, DC1

at 24 V 24 V 24 V

Min. current 0,10 A 0,10 A 0,10 A

Max. current 5,0 A 5,0 A 5,0 A

Max. power 120 W 120 W 120 W
Utilisation category

In accordance with the

standard EN 60947-5-1 EN 60947-5-1 EN 60947-5-1

Auxiliary contacts,

AC15 at 230 V 230 V 230 V

Max. current 2,0 A 2,0 A 2,0 A

Auxiliary contacts,

DC13 (6 cycles/min) at 24 V 24 V 24 V

Max. current 1,5 A 1,5 A 1,5 A

Max. conductor cross
section

Max. conductor cross
section

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Relay outputs 839770 840760 840765

Contact fuse protection,
external auxiliary contacts

Blow-out fuse, quick 6 A 6 A 6 A

Blow-out fuse, slow 4 A 4 A 4 A

Circuit breaker, 24

V AC/DC, characteristic

B/C 4 A 4 A 4 A
Contact material AgCdO + 3,0 µm Au AgCdO + 3,0 µm Au AgCdO + 3,0 µm Au

Times 839770 840760 840765

Switch-on delay

Typ. switch-on delay 350 ms 350 ms 350 ms

Environmental data 839770 840760 840765

Climatic suitability EN 60068-2-78 EN 60068-2-78 EN 60068-2-78
Ambient temperature

Temperature range -10 - 55 °C -10 - 55 °C -10 - 55 °C
Storage temperature

Temperature range -40 - 85 °C -40 - 85 °C -40 - 85 °C
EMC EN 60947-5-1, EN 61000-

6-2

Vibration

In accordance with the

standard EN 60068-2-6 EN 60068-2-6 EN 60068-2-6

Frequency 10,0 - 55,0 Hz 10,0 - 55,0 Hz 10,0 - 55,0 Hz

Amplitude 0,35 mm 0,35 mm 0,35 mm
Airgap creepage

In accordance with the

standard EN 60947-1 EN 60947-1 EN 60947-1

Overvoltage category III / II III / II III / II

Pollution degree 2 2 2
Rated insulation voltage 250 V 250 V 250 V
Rated impulse withstand

voltage 4,00 kV 4,00 kV 4,00 kV
Protection type

Mounting (e.g. cabinet) IP54 IP54 IP54

Housing IP40 IP40 IP40

Terminals IP20 IP20 IP20

Mechanical data 839770 840760 840765

Mounting position Any Any Any
Mechanical life 10,000,000 cycles 10,000,000 cycles 10,000,000 cycles
Material

Bottom PPO UL 94 V0 PPO UL 94 V0 PPO UL 94 V0

Front ABS UL 94 V0 ABS UL 94 V0 ABS UL 94 V0

Top PPO UL 94 V0 PPO UL 94 V0 PPO UL 94 V0

EN 60947-5-1, EN 61000­6-2

EN 60947-5-1, EN 61000­6-2

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Electronic monitoring relays PMDsrange

Thermistor monitor

S1MS

Mechanical data 839770 840760 840765

Conductor cross section
with screw terminals

1 core flexible 0,20 - 4,00 mm², 24 - 10

AWG

2 core with the same

cross section, flexible

with crimp connectors,

no plastic sleeve

2 core with the same

cross section, flexible

without crimp connec-

tors or with TWIN crimp

connectors
Torque setting with screw

terminals 0,60 Nm 0,60 Nm 0,60 Nm
Connection type Screw terminal Screw terminal Screw terminal
Mounting type Fixed Fixed Fixed
Dimensions

Height 87,0 mm 87,0 mm 87,0 mm

Width 22,5 mm 22,5 mm 22,5 mm

Depth 121,0 mm 121,0 mm 121,0 mm
Weight 160 g 160 g 160 g

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 4,00 mm², 24 - 10
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 4,00 mm², 24 - 10
AWG

0,20 - 2,50 mm², 24 - 14
AWG

0,20 - 2,50 mm², 24 - 14
AWG

Order reference

Order reference

Order

Type Features Terminals

S1MS 24 VAC/DC Screw terminals 840 775

S1MS 48 VAC Screw terminals 840 725

S1MS 110 VAC Screw terminals 840 740

S1MS 230 VAC Screw terminals 840 760

S1MS 240 V AC Screw terminals 840 765

S1MS 400 VAC Screw terminals 839 770

no.

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