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Siemens 3RU2136-4DB0 — Overload Relays

Siemens 3RU2136-4DB0 SIRIUS Overload Relay, CLASS 10, 25 A

MPN3RU2136-4DB0
Active

Siemens SIRIUS 3RU2136-4DB0 thermal overload relay, size S2, CLASS 10, 25 A at 600 V, 11 kW at 400 V, screw terminals, contactor mounting.

$35.56Ref. price · indicative, final on quote
Siemens 3RU2136-4DB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RU2136-4DB0 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationthermal overload relay
Frame size (overload relay)S2
Combinable contactor sizesS2
Reference code (IEC 81346-2)F
3RU2136-4DB0 — Protection & Trip
ParameterValue
Overload current setting range18 ... 25 A
Trip classCLASS 10
Overload release typethermal
3RU2136-4DB0 — Electrical (main circuit)
ParameterValue
Rated operational current25 A
Poles (main circuit)3
Rated operating frequency50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)690 V
Rated value (AC-3e), max.690 V
Rated surge withstand voltage6 kV
Main current circuitscrew-type terminals
Power loss at rated current (hot)10.5 W
Per pole3.5 W
3RU2136-4DB0 — Auxiliary contacts
ParameterValue
Auxiliary contacts: NO1
Auxiliary contacts: NC1
Auxiliary contacts: CO (changeover)0
Auxiliary switch short-circuit protection (required fuse)fuse gG: 6 A, quick: 10 A
Switching current at 24 V2 A
Switching current at 60 V0.3 A
Switching current at 110 V0.22 A
Switching current at 120 V3 A
Switching current at 125 V0.22 A
Switching current at 220 V0.11 A
Switching current at 230 V2 A
Switching current at 400 V1 A
3RU2136-4DB0 — Connection & Mounting
ParameterValue
Mounting / fastening methodContactor mounting
Mounting positionany
Main-circuit connector arrangementTop and bottom
Auxiliary/control circuit connection typescrew-type terminals
Removable aux./control terminalNo
Conductor cross-section: solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section: finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor range (AWG), main contacts2x (18 ... 2), 1x (18 ... 1)
Conductor range (AWG), auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
3RU2136-4DB0 — Environmental
ParameterValue
Operating temperature-40 ... +70 °C
Storage temperature-55 ... +80 °C
Transport temperature-55 ... +80 °C
Relative humidity, operating10 ... 95 %
Max. installation altitude2 000 m
3RU2136-4DB0 — Mechanical
ParameterValue
Width55 mm
Height90 mm
Depth105 mm

Product details

CLASS 10 trip and motor protection coordination

The 3RU2136-4DB0: This coordinates with standard motor starting profiles — a motor that stalls or jams will be disconnected before the winding insulation reaches its thermal limit. Rated motor power at 400 V is 11 kW, at 500 V is 15 kW, and at 690 V is 22 kW. The continuous current rating at 480 V and 600 V is 25 A. These figures define the maximum motor frame size this relay protects in a given line voltage.

Auxiliary contact signal ratings

These ratings cover direct connection to 24 VDC PLC inputs as well as 120 V and 230 V AC control circuits — no interposing relay needed for most panels.

Fastening method is contactor mounting — this relay snaps directly onto the matching SIRIUS contactor, not onto a DIN rail standalone. Dimensions are 105 mm depth, 55 mm width, 90 mm height. Temperature compensation is active from -40 to +60 °C, ensuring the trip curve stays accurate across the panel's ambient range.

Frequently asked questions

What is the closest functional second-source for 3RU2136-4DB0?

The 3RV6021-4DA10 is a peer overload relay from the same SIRIUS family, but it is a different size (S0 vs S2) and has different mounting and current ranges. The 3RU2136-4DB0 is size S2, rated 25 A at 600 V, while the 3RV6021-4DA10 is size S0. They are not drop-in replacements without panel rework.

MPN
3RU2136-4DB0