3RT1045-3BW44
CONTACTOR 3-PH, 37KW/400V,

From SIEMENS

Power contactor, AC-3 80 A, 37 kW / 400 V 48 V DC 3-pole, Size S00-S12 Screw terminal Auxiliary circuit: Spring-type terminal !!! Phased-out product !!! Successor is SIRIUS 3RT2
Product brand nameSIRIUS
Product designationpower contactor
General technical data
Size of contactorS3
Insulation voltage
rated value1 000 V
Degree of pollution3
Surge voltage resistance rated value6 kV
maximum permissible voltage for safe isolation
between coil and main contacts acc. to EN 60947-1690 V
Protection class IP
on the frontIP20; IP20 on the front with cover / box terminal
of the terminalIP00
Shock resistance at rectangular impulse
at DC6,8g / 5 ms, 4g / 10 ms
Shock resistance with sine pulse
at DC10,6g / 5 ms, 6,2g / 10 ms
Mechanical service life (switching cycles)
of contactor typical10 000 000
of the contactor with added electronics-compatible auxiliary switch block typical5 000 000
of the contactor with added auxiliary switch block typical10 000 000
Reference code acc. to DIN EN 81346-2Q
Ambient conditions
Installation altitude at height above sea level
maximum2 000 m
Main circuit
Number of poles for main current circuit3
Number of NO contacts for main contacts3
Number of NC contacts for main contacts0
Operating current
at AC-1 at 400 V
— at ambient temperature 40 °C rated value120 A
at AC-1
— up to 690 V at ambient temperature 40 °C rated value120 A
— up to 690 V at ambient temperature 60 °C rated value100 A
— up to 1000 V at ambient temperature 40 °C rated value60 A
— up to 1000 V at ambient temperature 60 °C rated value50 A
at AC-3
— at 400 V rated value80 A
— at 690 V rated value58 A
— at 1000 V rated value30 A
at AC-4 at 400 V rated value66 A
Connectable conductor cross-section in main circuit at AC-1
at 60 °C minimum permissible35 mm²
at 40 °C minimum permissible50 mm²
Operating current for approx. 200000 operating cycles at AC-4
at 400 V rated value34 A
at 690 V rated value22 A
Operating current
at 1 current path at DC-1
— at 24 V rated value100 A
— at 110 V rated value9 A
with 2 current paths in series at DC-1
— at 24 V rated value100 A
— at 110 V rated value100 A
with 3 current paths in series at DC-1
— at 24 V rated value100 A
— at 110 V rated value100 A
Operating current
at 1 current path at DC-3 at DC-5
— at 24 V rated value40 A
— at 110 V rated value2.5 A
with 2 current paths in series at DC-3 at DC-5
— at 24 V rated value100 A
— at 110 V rated value100 A
with 3 current paths in series at DC-3 at DC-5
— at 24 V rated value100 A
— at 110 V rated value100 A
Operating power
at AC-1
— at 230 V at 60 °C rated value38 kW
— at 400 V rated value66 kW
— at 690 V rated value114 kW
— at 690 V at 60 °C rated value114 kW
— at 1000 V at 60 °C rated value82 W
at AC-2 at 400 V rated value37 kW
at AC-3
— at 230 V rated value22 kW
— at 400 V rated value37 kW
— at 500 V rated value45 kW
— at 690 V rated value55 kW
— at 1000 V rated value37 W
Operating power for approx. 200000 operating cycles at AC-4
at 400 V rated value17.9 kW
at 690 V rated value21.1 kW
Thermal short-time current limited to 10 s760 A
Power loss [W] at AC-3 at 400 V for rated value of the operating current per conductor7.7 W
No-load switching frequency
at DC1 000 1/h
Operating frequency
at AC-1 maximum900 1/h
at AC-2 maximum400 1/h
at AC-3 maximum1 000 1/h
at AC-4 maximum300 1/h
Control circuit/ Control
Type of voltage of the control supply voltageDC
Control supply voltage at DC
rated value48 V
Operating range factor control supply voltage rated value of magnet coil at DC
initial value0.8
Full-scale value1.1
Closing power of magnet coil at DC15 W
Holding power of magnet coil at DC15 W
Closing delay
at DC90 ... 230 ms
Opening delay
at DC14 ... 20 ms
Arcing time10 ... 15 ms
Auxiliary circuit
Number of NC contacts for auxiliary contacts
instantaneous contact2
Number of NO contacts for auxiliary contacts
instantaneous contact2
Operating current at AC-12 maximum10 A
Operating current at AC-15
at 230 V rated value6 A
at 400 V rated value3 A
Operating current at DC-12
at 60 V rated value6 A
at 110 V rated value3 A
at 220 V rated value1 A
Operating current at DC-13
at 24 V rated value10 A
at 60 V rated value2 A
at 110 V rated value1 A
at 220 V rated value0.3 A
Contact reliability of auxiliary contacts1 faulty switching per 100 million (17 V, 1 mA)
UL/CSA ratings
Contact rating of auxiliary contacts according to ULA600 / Q600
Short-circuit protection
Design of the fuse link
for short-circuit protection of the main circuit
— with type of coordination 1 requiredfuse gL/gG: 250 A
— with type of assignment 2 requiredfuse gL/gG: 160 A
for short-circuit protection of the auxiliary switch requiredfuse gL/gG: 10 A
Installation/ mounting/ dimensions
(mounting type)screw and snap-on mounting onto 35 mm and 75 mm standard mounting rail
Mounting type Side-by-side mountingYes
Height146 mm
Width70 mm
Depth201 mm
Required spacing
for grounded parts
— at the side6 mm
Connections/Terminals
Type of electrical connection
for main current circuitscrew-type terminals
for auxiliary and control current circuitspring-loaded terminals
Type of connectable conductor cross-sections
for main contacts
— solid2x (2.5 ... 16 mm²)
— stranded2x (10 ... 50 mm²)
— single or multi-stranded2x (2,5 ... 16 mm²)
— finely stranded with core end processing2x (2.5 ... 35 mm²)
— finely stranded without core end processing2x (10 ... 35 mm²)
at AWG conductors for main contacts2x (10 ... 1/0)
Type of connectable conductor cross-sections
for auxiliary contacts
— solid2x (0.25 ... 2.5 mm²)
— finely stranded with core end processing2x (0.25 ... 1.5 mm²)
— finely stranded without core end processing2x (0.25 ... 2.5 mm²)
at AWG conductors for auxiliary contacts2x (24 ... 14)

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