ABB TF42 Thermal Overload Relay

ABB TF42 Thermal Overload Relays


Thermal Overload Relay Applications

  • Temperature compensation from -25 … +60 °C
  • Adjustable current setting for overload protection
  • Automatic or manual reset selectable
  • Suitable for three- and single-phase application
  • Trip-free mechanism
  • Status indication
  • STOP and TEST function
  • Direct mounting onto block contactors
  • Sealable operating elements

Description

  • 45mm width
  • Suitable for contactor AF09 ... AF38
  • Sealable operating elements

Application / internal function

The thermal overload relays are three pole relays with bimetal tripping elements (1 per pole). The motor current flows through
the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal
elements become bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching
position (95-96 / 97-98). The contact 95-96 is used to control the load contactor.

The overload relays have a setting scale in Amperes, which allows the direct adjusting of the relay without any additional
calculation. In compliance with international and national standards, the setting current is the rated current of the motor
and not the tripping current (no tripping at 1.05 x I, tripping at 1.2 x I; I = setting current). The relays are constructed in way
that they protect themselves in the event of an overload. The overload relay has to be protected against short-circuit. The
appropriate short-circuit protection devices are shown in the table.

Ordering Details

Setting Ranges Type Order Code Max. Fuse Suitable for Contactors
0.31 ... 0.41 TF42-0.41 1SAZ 721 201 R1014 2gG AF09 - AF38
0.55 ... 0.74 TF42-0.74 1SAZ 721 201 R1021 4 gG AF09 ... AF38
0.74 ... 1.00 TF42-1.0 1SAZ 721 201 R1023 6 gG AF09 ... AF38
1.00 ... 1.30 TF42-1.3 1SAZ 721 201 71025 6 gG AF09 ... AF38
1.30 ... 1.70 TF42-1.7 1SAZ 721 201 R1028 10 gG AF09 ... AF38
1.70 ... 2.30 TF42 - 2.3 1SAZ 721 201 R1031 10 gG AF09 ... AF38
2.30 ... 3.10 TF42-3.1 1SAZ 721 201 R1033 10 gG AF09 ... AF38
3.10 ... 4.20 TF42-4.2 1SAZ 721 201 R1035 20 gG AF09 ... AF38
4.20 ... 5.70 TF42-5.7 1SAZ 721 201 R1038 20 gG AF09... AF38
5.70 ... 7.60 TF42-7.6 1SAZ 721 201 R1040 35 gG AF09 ... AF38
7.60 ... 10.0 TF42-10 1SAZ 721 201 R1043 35 gG AF09 ... AF38
10.0 ... 13.0 TF42-13 1SAZ 721 201 R1045 40 gG AF09 ... AF38
13.0 ... 16.0 TF42-16 1SAZ 721 201 R1047 40 gG AF09 ... AF38
16.0 ... 20.0 TF42-20 1SAZ 721 201 R1049 63 gG AF09 ... AF38
20.0 ... 24.0 TF42-24 1SAZ 721 201 R1051 63 gG AF09 ... AF38

Technical Data

Overload Relay Type     TF42  
      Up to 20.0 A Up to 38.0 / 40.0 A
Standards Conformity to standards   IEC / EN60947-1, IEC/EN60947-4-1, IEC/EN60947-5-1,
UL 508, CSA C22.2 No. 14
  Phase loss sensitivity (acc. to IEC / EN 60947-4-1) Yes  
General Data Mounting Position   Position 1  
  Degree of protection (acc. to IEC 60947-1) IP 20  
IEC        
Main Circuit Rated Operational Voltage Ue 690 V AC  
  Rated operational current AC-3 Ie up to 20.0A up to 38.0 / 40.0 A (50oC)
  Rated Frequency 50 / 60 Hz  
  Trip Class 10  
Isolation Data Rated impulse withstand voltage Uimp 6kV  
(acc. to IEC/EN 60947-1) Rated isnulation voltage Ui 690 V  
Environmental Data Ambient air temperature range    
  Operation Open - compensated -25 ... + 60oC  
    Open -25 ... + 60oC  
  Storage   -50 .. + 80oC  
  Altitude   ≤ 2000m  
  Vibration (acc. to IEC/EN 60068-2-27) 5 g / 3-150Hz  
  Shock (acc. to IEC/EN 60068-2-27) 25 g / 11 ms  
Auxiliary Circuit Rated Operational Voltage Ue (acc. to IEC/EN 60947-5-1 Utilisation category)  
  AC-15 110-120V N.C. 3A
      N.O. 0.75A
    220-230-240 V N.C. 3A
      N.O. 0.75A
    400V N.C. 0.75A
      N.O. 0.75A
    480-500 V N.C. 0.75A
      N.O. 0.75A
    600 V N.C. 0.6A
      N.O. -
  DC-13 24 V N.C. 1.25A
      N.O. 1.25A
    110-120-125V N.C. 0.55A
      N.O. 0.55A
    250 V N.C. 0.27A
      N.O. 0.27A
    500 V N.C. 0.15A
      N.O. 0.15A
  Minimum Switching Capacity   17 V / 3mA
  Short-Circuit Protection Device N.C. 6
      N.O. 4
Connecting Capacity Main Circuit Rigid 1 or 2 x 0.75 ... 4 mm2 1.5 ... 2.5mm2 - 2.5 ... 10 mm2
    Flexible with ferrule 1 or 2 x 0.75 ... 4 mm2 1.5 .. 6 mm2
    Flexible without ferrule 1 or 2 x 0.75 ... 4 mm2 2.5 ... 4 mm2 - 4 ... 6 mm2
    Stripping Length 12mm  
    Tightening torque 1.5 ... 2.5 Nm 2.5 ... 2.7 Nm
UL / CSA        
Main Circuit Max. Operational Voltage   600 V AC  
  Trip Rating   125% of FLA  
Connecting Capacity Main Circuit Stranded 1 or 2 x AWG 18 ... 10 AWG 14 ... 6
    Flexible without Ferrule 1 or 2 x AWG 18 ... 10 AWG 14 ... 6
    Stripping length 12mm  
    Tightening torque 13... 22 lb.in 22 lb.in
  Auxiliary Circuit Stranded 1 or 2 x AWG 18 ... 12  
    Flexible without ferrule 1 or 2 x AWG 18 ... 12  
    Stripping Length 9 mm  
    Tightening Torque 9 ... 13lb.in