3RB2045-1UB0
OVERLOAD RELAY 12.5...50 A

From SIEMENS

Overload relay 12.5...50 A For motor protection Size S3, Class 10 Contactor mounting Main circuit: Screw terminal Auxiliary circuit: Screw terminal Manual RESET !!! Phased-out product !!! Successor is SIRIUS 3RB3 Preferred successor type is >>3RB2046-1UB0<<
Product brand nameSIRIUS
Product designationsolid-state overload relay
General technical data
Size of contactor can be combined company-specificS3
Power loss [W] total typical0.05 W
Insulation voltage
with degree of pollution 3 rated value1 000 V
Surge voltage resistance rated value8 kV
Protection class IP
on the frontIP00
Shock resistance15g / 11 ms
Type of protectionPTB 06 ATEX 3001 Ex II (2) GD
Reference code acc. to DIN EN 81346-2F
Ambient conditions
Installation altitude at height above sea level
maximum2 000 m
Relative humidity during operation100 %
Main circuit
Number of poles for main current circuit3
Adjustable pick-up value current of the current-dependent overload release12.5 ... 50 A
Operating voltage
at AC-3 rated value maximum1 000 V
Auxiliary circuit
Number of NC contacts for auxiliary contacts1
Number of NO contacts for auxiliary contacts1
Number of CO contacts
for auxiliary contacts0
Operating current of auxiliary contacts at AC-15
at 24 V4 A
at 110 V4 A
at 120 V4 A
at 125 V4 A
at 230 V3 A
Operating current of auxiliary contacts at DC-13
at 24 V2 A
at 60 V0.55 A
at 110 V0.3 A
at 125 V0.3 A
at 220 V0.11 A
Protective and monitoring functions
Trip classCLASS 10E
Short-circuit protection
Design of the fuse link
for short-circuit protection of the auxiliary switch requiredfuse gL/gG: 6 A
Installation/ mounting/ dimensions
Mounting positionany
Mounting typeMounting contactor
Height106 mm
Width70 mm
Depth124 mm
Required spacing
with side-by-side mounting
— forwards0 mm
— Backwards0 mm
— upwards0 mm
— downwards0 mm
— at the side0 mm
for grounded parts
— forwards0 mm
— Backwards0 mm
— upwards0 mm
— at the side6 mm
— downwards0 mm
for live parts
— forwards0 mm
— Backwards0 mm
— upwards0 mm
— downwards0 mm
— at the side6 mm
Connections/Terminals
Product function
removable terminal for auxiliary and control circuitYes
Type of electrical connection
for main current circuitscrew-type terminals
for auxiliary and control current circuitscrew-type terminals
Type of connectable conductor cross-sections
for main contacts
— solid2x (2.5 ... 16 mm²)
— stranded2x (10 ... 50 mm²), 10 ... 70 mm²
— finely stranded with core end processing2x (2.5 ... 35 mm²), 2.5 ... 50 mm²
at AWG conductors for main contacts2x (10 ... 1/0), 1x (10 ... 2/0)
Type of connectable conductor cross-sections
for auxiliary contacts
— solid0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)
— finely stranded with core end processing0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)
at AWG conductors for auxiliary contacts2x (20 ... 14)
Electromagnetic compatibility
Conducted interference
due to burst acc. to IEC 61000-4-42 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3
due to conductor-earth surge acc. to IEC 61000-4-52 kV (line to earth) corresponds to degree of severity 3
due to conductor-conductor surge acc. to IEC 61000-4-51 kV (line to line) corresponds to degree of severity 3
Field-bound parasitic coupling acc. to IEC 61000-4-310 V/m
Electrostatic discharge acc. to IEC 61000-4-26 kV contact discharge / 8 kV air discharge

External links