ABB Thermal Overload relays Technical Data
2
0 20 40 60 80 100(%)
Closing time
0
20
40
60
80
100
120
140
Switching frequency
(ops/h)
ta = 0.5s
ta = 1s
ta = 1.5s
ta = 3s
ta = 3.5s
Intermittent duty
Ambient temperature
compensation limits
according to IEC 947-4-1
No tripping
Multiple of the setting current
Tripping
Ambient temperature
-20 -10 0 10 20 30 40 50
0.9
1.0
1.1
1.2
1.3
1.4
1.5
40
20
11
10
6
4
3
2
1
3 4 5
6 7
7.4
8
[s]
Multiple of the setting current
Tripping time
Thermal
Overload
relays
Switching frequency
in relation to load factor.
ta:
motor starting time.
Technical data
TA25DU – TA450DU
Switchingfrequency:
To avoid untimely tripping, TA and T thermal O/L relays have been designed to withstand roughly 15 switching operations
per hour with an approximately equal distribution between working and rest cycles.
In these conditions, the motor starting time must not exceed 1 second and the starting current must be lower than or equal
to 6 times the motor I
For intermittent operations, the diagram opposite species relay operating limits.
Example: Motor starting time: 1 sec.
Load factor: 40 %
Switching frequency: 60 ops./h according to diagram
For a higher number of operations and for load variations (e.g. frequent starting and braking), it is advisable to use
CUSTORAPID
For motors subject to particularly severe operating conditions (e.g. locked rotor) it is advisable to use protection combined
with a thermal O/L relay and the CUSTORAPID
Protection of motors with long starting time
See electronic overload relay section, pages 2.21 - 2.32.
Mounting position
On a support at an angle of ± 30° in relation to the vertical plane (standard position).
Other mounting positions possible, except mounting on a horizontal plane (in this case the tripping
mechanism would be located above the bimetals).
SpecialversionforEExemotors
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system.
Tripping limits at ambient temperatures varying by + 20°C
Ambient temperature compensation
Thermal O/L relays are compensated against ambient temperature
variations by a compensation bimetal which is sensitive to the
ambient temperature.
Thermal O/L relays are designed to operate between – 5 °C and
+40 °C in compliance with standard IEC 947-4-1. For a wider range
of –25° C to +55 °C consult the graph opposite.
Example:tripping at – 25 °C. Tripping takes place before 1.5 times
the setting current.
Resetting:TA25DU – TA450 DU thermal O/L relays have convertible
manual/automatic resetting.
Delivery:in manual resetting mode.
TA thermal O/L relay cold-state
tripping characteristics
2.10 Low Voltage Products & Systems
1SXU000023C0202 ABB Inc. • 888-385-1221 • www.abb.us/lowvoltage
Technical data
A1
A2
TA25DU – TA80DU
Thermal
Overload
relays
Types TA25DU TA42DU TA75DU TA80DU
Standards:
(international, European)
Rated insulation voltage Ui V 690
according to IEC 947-4-1
Rated impulse withstand voltage U
according to IEC 947-4-1
Permissible ambient temperature
– for storage °C –40 to +70
– for operation °C –25 to +55 with temperature compensation (maximum values: see page 2.9)
Climatic withstand DIN 50017 Humidity in alternate climate KFW, 30 cycles
Mounting positions On a support at an angle of ±30° in relation to the vertical plane (standard position). Other positions
possible except mounting on a horizontal plane (in this case the tripping mechanism
would be located above the bimetals).
Shock withstand shock duration ms 15
at nominal Ie
Critical direction
of shocks A1, A2 multiples of g 12
Resistance to vibrations
(±1 mm, 50 Hz) multiples of g 8
Mounting – on contactor Latching below the contactor, screw xing on main terminals
– separate with DB - kit Using screws: 2 x M4 or 35 mm EN 50022
Terminals and cross-sectional areas TA25DU setting ranges:
for main conductors (motor side) from 0.1-0.16A 24-32 A
• screw terminal to 18-25A
– with cable clamp M4 –
– via tunnel connector – M5 M6 M6 M6
– at type for lug or bar – – – – –
• conductor cross-sectional area
– rigid solid or rigid stranded mm2 2 x 1.5 - 6 1 x 10 1 x 2.5 - 35 or 2 x 2.5 x 16
– exible with cable end mm2 2 x 1.5 - 4 2 x 0.75- 6 1 x 2.5 - 25 or 2 x 2.5 x 10
– recommended bars mm – – – – –
Terminals and cross-sectional area
for auxiliary conductors
• screw terminal (screw size)
– with cable clamp M 3.5
• conductor cross-sectional area
– rigid solid or rigid stranded 2 x mm2 0.75 - 4
– exible with cable end 2 x mm2 0.75 - 2.5
Degree of protection All the terminals are protected against direct contact according to All the terminals are
VDE 0106/Part. 100. (without additional terminal shrouds) protected against direct
direct contact according to
VDE0106/part 100 (with
additional terminal shrouds
for the main terminals
kV 6
imp
IEC 947-4-1, EN 60947-4-1
2
Pole Technical Characteristics
Types TA25 TA42 TA75 TA80 TA10 TA200 TA450
DU DU DU DU DU DU DU
Number of poles 3
Setting ranges see page 2.6
Tripping class according to IEC 947-4-1, EN 60947-1 10 A
Rated operational frequencies Hz 0 - 400 50/60
Max. switching frequency Up to 15 starts/h or 60 starts/h with 40 % on-load factor when neither
without untimely tripping the starting current of 6 x In nor the starting time 1 s are exceeded.
Resistance per phase in mΩ
and heat dissipation in W see page 2.13
Low Voltage Products & Systems 2.11
ABB Inc. • 888-385-1221 • www.abb.us/lowvoltage 1SXU000023C0202
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