Article number 3RU1146-4LB0 3RU2146-4LB0
Overload relay 70...90 A For motor protection Size S3, Class 10 Contactor mounting Main circuit: Screw terminal Auxiliary circuit: Screw terminal Manual-Automatic-Reset !!! Phased-out product !!! Successor is SIRIUS 3RU2 Preferred successor type is >>3RU2146-4LB0<< Overload relay 70...90 A Thermal For motor protection Size S3, Class 10 Contactor mounting Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset
product brand name SIRIUS
product designation thermal overload relay
product type designation 3RU2
General technical data
size of overload relay S3
size of contactor can be combined company-specific S3
power loss [W] for rated value of the current at AC in hot operating state 21 W
● per pole 7 W
insulation voltage with degree of pollution 3 at AC rated value 1 000 V
surge voltage resistance rated value 8 kV
maximum permissible voltage for safe isolation in networks with grounded star point
● between auxiliary and auxiliary circuit 440 V
● between auxiliary and auxiliary circuit 440 V
● between main and auxiliary circuit 440 V
● between main and auxiliary circuit 440 V
protection class IP
● on the front IP20
● of the terminal IP00
shock resistance 8g / 10 ms
● according to IEC 60068-2-27 8g / 11 ms
type of protection DMT 98 ATEX G 001
type of protection according to ATEX directive 2014/34/EU Ex II (2) GD
certificate of suitability according to ATEX directive 2014/34/EU DMT 98 ATEX G 001
reference code according to IEC 81346-2 F
Substance Prohibitance (Date) 07/01/2006 03/01/2017
Ambient conditions
installation altitude at height above sea level maximum 2 000 m
ambient temperature
● during operation -20 ... +70 °C -40 ... +70 °C
● during storage -55 ... +80 °C
● during transport -55 ... +80 °C
temperature compensation -40 ... +60 °C
relative humidity during operation 100 % 10 ... 95 %
Main circuit
number of poles for main current circuit 3
adjustable current response value current of the current-dependent overload release 70 ... 90 A
operating voltage
● rated value 690 V
● at AC-3e rated value maximum 1 000 V
operating frequency rated value 50 ... 60 Hz
operational current rated value 90 A
operational current at AC-3e at 400 V rated value 90 A
operating power at AC-3e
● at 400 V rated value 45 kW
● at 690 V rated value 75 kW
Auxiliary circuit
design of the auxiliary switch integrated
number of NC contacts for auxiliary contacts 1
● note for contactor disconnection
number of NO contacts for auxiliary contacts 1
● note for message "Tripped"
number of CO contacts for auxiliary contacts 0
operational current of auxiliary contacts at AC-15
● at 24 V 3 A
● at 110 V 3 A
● at 120 V 3 A
● at 125 V 3 A
● at 230 V 2 A
● at 400 V 1 A
operational current of auxiliary contacts at DC-13
● at 24 V 1 A 2 A
● at 60 V 0.3 A
● at 110 V 0.22 A
● at 125 V 0.22 A
● at 220 V 0.11 A
design of the miniature circuit breaker for short-circuit protection of the auxiliary switch required 6A (SCC less than equal to 0.5 kA; U less than equal to 260V)
contact rating of auxiliary contacts according to UL B600 / R300
Protective and monitoring functions
trip class CLASS 10
design of the overload release thermal
UL/CSA ratings
full-load current (FLA) for 3-phase AC motor
● at 480 V rated value 77 A
● at 600 V rated value 77 A
Short-circuit protection
design of the fuse link
● for short-circuit protection of the main circuit
— with type of coordination 1 required gG: 250 A
— with type of assignment 2 required gG: 160 A
● for short-circuit protection of the auxiliary switch required fuse gL/gG: 6 A, quick: 10 A fuse gG: 6 A, quick: 10 A
Installation/ mounting/ dimensions
mounting position with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back any
fastening method Contactor mounting
height 120 mm 105 mm
width 70 mm
depth 140 mm 125 mm
required spacing
● with side-by-side mounting
— forwards 0 mm
— backwards 0 mm
— upwards 0 mm
— downwards 0 mm
— at the side 0 mm
● for grounded parts
— forwards 0 mm
— backwards 0 mm
— upwards 0 mm
— at the side 6 mm
— downwards 0 mm
● for live parts
— forwards 0 mm
— backwards 0 mm
— upwards 0 mm
— downwards 0 mm
— at the side 6 mm
Connections/ Terminals
product component removable terminal for auxiliary and control circuit No
type of electrical connection
● for main current circuit screw-type terminals
● for auxiliary and control circuit screw-type terminals
arrangement of electrical connectors for main current circuit Top and bottom
type of connectable conductor cross-sections
● for main contacts
— solid 2x (2.5 ... 16 mm²)
— stranded 2x (10 ... 50 mm²), 10 ... 70 mm² 2x (6 ... 16 mm²), 2x (10 ... 50 mm²), 1x (10 ... 70 mm²)
— solid or stranded 2x (2,5 ... 50 mm²), 1x (10 ... 70 mm²)
— finely stranded with core end processing 2x (2.5 ... 35 mm²), 2.5 ... 50 mm² 2x (2.5 ... 35 mm²), 1x (2.5 ... 50 mm²)
● at AWG cables for main contacts 2x (10 ... 1/0), 1x (10 ... 2/0)
type of connectable conductor cross-sections
● for auxiliary contacts
— solid 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
— solid or stranded 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
— finely stranded with core end processing 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
● at AWG cables for auxiliary contacts 2x (20 ... 16), 2x (18 ... 14)
tightening torque
● for main contacts for ring cable lug 4.5 ... 6 N·m
outer diameter of the usable ring cable lug maximum 19 mm
tightening torque
● for main contacts with screw-type terminals 4.5 ... 6 N·m
● for auxiliary contacts with screw-type terminals 0.8 ... 1.2 N·m
design of screwdriver shaft Hexagonal socket
size of the screwdriver tip 4 mm hexagon socket
design of the thread of the connection screw
● for main contacts M8
● of the auxiliary and control contacts M3
Safety related data
T1 value for proof test interval or service life according to IEC 61508 20 y
touch protection against electrical shock finger-safe
protection class IP on the front according to IEC 60529 IP20
touch protection on the front according to IEC 60529 finger-safe, for vertical contact from the front
Display
display version for switching status Slide switch
Certificates/ approvals
General Product Approval
CSA CSA
Yes Yes
CCC CCC
Yes Yes
Confirmation Yes Yes
UL UL
Yes Yes
EAC EAC
Yes Yes
For use in hazardous locations
ATEX-EC-Type-Examination-Certificate ATEX-EC-Type-Examination-Certificate
Yes Yes
IECEx IECEx
Yes Yes
Declaration of Conformity
EC/EU-Declaration of Conformity EC/EU-Declaration of Conformity
Yes Yes
Test Certificates
Special Test Certificate Yes Yes
Type Test Certificates/Test Report Yes Yes
Marine / Shipping
ABS (American Bureau of Shipping) ABS (American Bureau of Shipping)
Yes Yes
LR (Lloyds Register) LR (Lloyds Register) 
Yes Yes
DNV-GL DNV-GL
Yes Yes
other
Confirmation Yes Yes
Miscellaneous Yes Yes
Railway
Special Test Certificate Yes Yes
Further information
Information- and Downloadcenter (Catalogs, Brochures,…)
Industry Mall (Online ordering system)
Cax online generator
Service&Support (Manuals, Certificates, Characteristics, FAQs,...)
Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, EPLAN macros, ...)
Characteristic: Tripping characteristics, I²t, Let-through current
Further characteristics (e.g. electrical endurance, switching frequency)
3RU1146-4LB0 3RU2146-4LB0
3RU1146-4LB0 3RU2146-4LB0
3RU1146-4LB0 3RU2146-4LB0
last modified: 3/8/2022
Date
8/17/2022
Subject to change without notice
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