SIRIUS 3RN2 thermistor motor protection

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  Информационные материалы

  Further information
  Home page, see http://www.siemens.com/relays	For the conversion tool, e.g. from 3RN1 to 3RN, see http://www.siemens.com/sirius/conversion-tool
  Industry Mall, see http://www.siemens.com/product?3RN2

  
  
  

  Thermistor motor protection devices are used for direct monitoring of the motor winding temperature. For this purpose, the motors are equipped with temperature-dependent resistors (PTC) that are directly installed in the motor winding and abruptly change their resistance at their temperature limit.

  Versions

  SIRIUS 3RN2 thermistor motor protection relays are available in the following versions:

  • Compact trip units 3RN2000
  • Compact/standard trip units 3RN2010
  • Bistable trip units 3RN2012-.BW31
  • Standard trip units with ATEX approval 3RN2011, 3RN2012-...30, 3RN2013
  • Trip units with ATEX approval and 2 sensor circuits for warning and disconnection 3RN2023

  The 3RN2 thermistor motor protection relays are suitable for use in any climate and are finger-safe according to IEC 60529.

  They comply with

  • IEC 60947-8. Low-voltage switchgear and controlgear – Part 8: "Control units for built-in thermal protection (PTC) for rotating electrical machines"
  • IEC 61000-6-2, IEC 61000-6-4. "Electromagnetic compatibility for industrial-process measurement and control equipment"

  The 3RN2 thermistor motor protection relays with ATEX approval fulfill SIL1 in compliance with EN 50495.

  The terminals of the auxiliary contacts are designated in accordance with EN 60947-1.

  3RN2 evaluation units are suitable for snap-on mounting onto TH 35 standard mounting rails according to IEC 60715 or for screw fixing using an adapter (accessory).

  Article No. scheme

  Product versions		Article number
  Thermistor motor protection relay with PTC sensor, type A		3RN20	❑	❑	-	❑	❑	❑	❑	❑
  Number and version of the sensor circuits	1 sensor circuit, supply voltage = root voltage		0
  	1 sensor circuit		1
  	2 sensor circuits for warning and tripping		2
  RESET	Auto RESET			0
  	Manual RESET, with wire-break and short-circuit detection			1
  	Manual/auto/remote RESET, non-volatile, with wire-break and short-circuit detection			2
  	Manual/auto/remote RESET, non-volatile, with wire-break and short-circuit detection, with protective separation			3
  Connection method	Screw terminals					1
  	Spring-type terminals					2
  Auxiliary switches	1 CO						A
  	2 CO						B
  	1 NO + 1 NC						C
  	1 NO + 1 CO						D
  	2 CO, hard gold-plated						G
  Rated control supply voltage	24 V AC/DC							A	3
  	24 ... 240 V AC/DC							W	3
  Response to failure	Monostable									0
  	Bistable									1
  Example		3RN2	0	0	-	1	A	A	3	0

  
  
  

  Note:

  The article number scheme is presented here merely for information purposes and for better understanding of the logic behind the article numbers. For your orders please use the article numbers quoted in the selection and ordering data.

  Область применения

  Direct motor protection through temperature monitoring of the motor winding offers 100% motor protection even under the most difficult ambient conditions, without the need to make adjustments on the device. Versions with hard gold-plated contacts ensure, in addition, a high switching reliability that is even higher than an electronic control.

  Motor protection:

  • At increased ambient temperatures
  • When switching frequency is too high
  • When start-up and braking procedures are too long
  • Used together with frequency converters (low speeds)

  ATEX approval for operation in areas subject to explosion hazard

  The SIRIUS thermistor motor protection relays 3RN2011, 3RN2012-...30, 3RN2013 and 3RN2023 for PTC sensors are certified according to ATEX Ex II (2) G and D for environments with explosive gas or dust loads.

  Motor protection using current- and temperature-dependent protective devices

  IEC 60204 stipulates that motors must be protected from overheating at a rating of 0.5 kW and higher. The protection can take the form of overload protection, overtemperature protection or current limiting.

  For motors with frequent starting and braking and in environments where cooling may be impaired (e. g. by dust), it is recommended to use the overtemperature protection option in the form of a protective device coordinated with this mode of operation. A good choice in this case is the use of 3RN2 thermistor motor protection devices.

  On rotor-critical motors, overtemperature detection in the stator windings can lead to delayed and hence inadequate protection. In this case the standards stipulate additional protection, e. g. by means of an overload relay.

  This combination of thermistor motor protection and an overload relay is recommended for full motor protection in case of frequent starting and braking of motors, irregular intermittent duty or excessive switching frequency. To prevent premature tripping of the overload relay in such operating conditions, a higher setting than that normally required for the operational current is chosen. The overload relay then performs the stall protection, and the 3RN2 thermistor motor protection relay monitors the temperature of the motor windings.

  Application	Motor protection
  	Only current-dependent, e. g. with overload relay	Only temperature-dependent, e.g. with thermistor motor protection relay	Current- and temperature-dependent
  Motor protection in case of
  Overloading in continuous duty	✓	✓	✓
  Long start-up and braking operations	o	✓	✓
  Irregular intermittent operation	o	✓	✓
  Excessively high switching frequency	o	✓	✓
  Single-phase operation and current unbalance	✓	✓	✓
  Voltage and frequency fluctuations	✓	✓	✓
  Stalling of the rotor	✓	✓	✓
  Switching on a stalled rotor of a stator-critical motor	✓	✓	✓
  Switching on a stalled rotor of a rotor-critical motor	✓	o	✓
  Elevated ambient temperature	--	✓	✓
  Impeded cooling	--	✓	✓

  
  
  

  ✓ full protection

  o conditional protection

  -- no protection

  Особенности

  • Thanks to direct motor protection, overdimensioning of the motors is not necessary
  • No settings on the device are necessary
  • Solid-state compatible output thanks to versions with hard gold-plated contacts
  • Rapid error diagnosis thanks to versions that indicate open and short circuits in the sensor circuit
  • All versions with removable terminals
  • All versions with screw or spring-type terminals with push-in functionality

  Технические данные

  Order number			3RN2000.A.. 3RN2010.C..	3RN201..B 3RN2013.G 3RN2023.D
  Width x Height x Depth		mm	100 × 17.5 × 90	100 × 22.5 × 90

  
  

  Order number			3RN2000-.AA30	3RN2010-.CA30 3RN2010-.BA30	3RN2000-.AW30 3RN2010-.CW30 3RN2010-.BW30	3RN2011-.BA30 3RN2012-.BA30	3RN2011-.BW30 3RN2012-.BW30	3RN2012-.BW31	3RN2013-.BA30	3RN2013-.BW30 3RN2013-.GW30	3RN2023-.DW30
  General technical data:
  Design of the electrical isolation			No separation	galvanic					Protective separation
  Electrical endurance (switching cycles) at AC-15 at 230 V typical			100 000
  Mechanical service life (switching cycles) typical			10 000 000
  Insulation voltage for overvoltage category III according to IEC 60664 with degree of pollution 3 rated value		V	300
  Surge voltage resistance rated value		kV	4						6
  Buffering time in the event of power failure minimum		ms	40								30
  Degree of pollution			3
  Protection class IP			IP20
  Shock resistance acc. to IEC 60068-2-27			11g / 15 ms
  Vibration resistance acc. to IEC 60068-2-6			10 ... 55 Hz: 0.35 mm
  Mounting type			screw and snap-on mounting onto 35 mm standard mounting rail
  ● Mounting position			any
  ● Installation altitude at height above sea level maximum		m	2 000
  Ambient temperature during operation			-25 ... +60
  Relative humidity during operation maximum		%	70
  ATEX
  Ex protection group of device and Ex protection category according to ATEX directive 2014/34/EU			--			--		--	--
  Safety device type acc. to IEC 61508-2			--			Type B		--	Type B
  Safety Integrity Level (SIL) acc. to IEC 61508			--			SIL1		--	SIL1
  Performance level (PL) acc. to EN ISO 13849-1			--			c		--	c
  T1 value for proof test interval or service life acc. to IEC 61508		y	--			3		--	3
  Measuring circuit:
  Number of measuring circuits			1								2
  Relative metering precision		%	9			2
  Number of sensors in series maximum			6
  Wire length of sensor maximum		m	2 800			250
  Response value of thermoresistor			1 500 ... 1 650			1 500 ... 1 550
  Release value of thermoresistor			3 400 ... 3 600			3 300 ... 3 350
  Control circuit:
  Ampacity of the output relay
  ● at AC-15 at 250 V at 50/60 Hz		A	3
  ● at DC-13 at 24 V		A	1
  ● at DC-13 at 125 V		A	0.2
  ● at DC-13 at 250 V		A	0.1
  Thermal current of the switching element with contacts maximum		A	5
  Continuous current of the DIAZED fuse link of the output relay		A	6
  Supply voltage:
  Control supply voltage
  ● at AC
  — at 50 Hz rated value			24 ... 24		24 ... 240	24 ... 24	24 ... 240		24 ... 24	24 ... 240
  — at 60 Hz rated value			24 ... 24		24 ... 240	24 ... 24	24 ... 240		24 ... 24	24 ... 240
  ● at DC rated value			24 ... 24		24 ... 240	24 ... 24	24 ... 240		24 ... 24	24 ... 240
  Operating range factor control supply voltage rated value
  ● at AC at 50 Hz			0.85 ... 1.1
  ● at AC at 60 Hz			0.85 ... 1.1
  ● at DC			0.85 ... 1.1

  
  

  Order number		3RN20..-2	3RN20..-1
  Type of electrical connection		Push-in terminal	screw-type terminals
  Tightening torque		--	0.6 ... 0.8
  Type of connectable conductor cross-sections
  ● solid		0.5 ... 4 mm²	1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)
  ● finely stranded / with core end processing		0.5 ... 2.5 mm²	1x (0.5 ... 4 mm²), 2x (0.5 ... 1.5 mm²)
  ● at AWG conductors
  — solid		20 ... 12	1x (20 ... 12), 2x (20 ... 14)
  — stranded		20 ... 12	--