Siemens 3RU2126-1CJ0 SIRIUS Overload Relay, Class 10, 690 V

Name: 3RU2126-1CJ0
Brand: Siemens
SKU: 3RU2126-1CJ0
Availability: LimitedAvailability
Author: RMA Rashid

Specifications

Identification

3RU2126-1CJ0 — Identification
Parameter	Value
Product brand name	SIRIUS
Product designation	thermal overload relay
Frame size (overload relay)	S0
Combinable contactor sizes	S0
Reference code (IEC 81346-2)	F

Protection & Trip

3RU2126-1CJ0 — Protection & Trip
Parameter	Value
Overload current setting range	1.8 ... 2.5 A
Trip class	CLASS 10
Overload release type	thermal

Electrical (main circuit)

3RU2126-1CJ0 — Electrical (main circuit)
Parameter	Value
Rated operational current	2.5 A
Poles (main circuit)	3
Rated operating frequency	50 ... 60 Hz
Rated insulation voltage (AC, pollution degree 3)	690 V
Rated value (AC-3e), max.	690 V
Rated surge withstand voltage	6 kV
Main current circuit	Ring cable lug connection
Power loss at rated current (hot)	5.7 W
Per pole	1.9 W

Auxiliary contacts

3RU2126-1CJ0 — Auxiliary contacts
Parameter	Value
Auxiliary contacts: NO	1
Auxiliary contacts: NC	1
Auxiliary contacts: CO (changeover)	0
Auxiliary switch short-circuit protection (required fuse)	fuse gG: 6 A, quick: 10 A
Switching current at 24 V	2 A
Switching current at 60 V	0.3 A
Switching current at 110 V	0.22 A
Switching current at 120 V	3 A
Switching current at 125 V	0.22 A
Switching current at 220 V	0.11 A
Switching current at 230 V	2 A
Switching current at 400 V	1 A

Connection & Mounting

3RU2126-1CJ0 — Connection & Mounting
Parameter	Value
Mounting / fastening method	Contactor mounting
Mounting position	any
Main-circuit connector arrangement	Top and bottom
Auxiliary/control circuit connection type	ring terminal lug connection
Removable aux./control terminal	No

Environmental

3RU2126-1CJ0 — Environmental
Parameter	Value
Operating temperature	-40 ... +70 °C
Storage temperature	-55 ... +80 °C
Transport temperature	-55 ... +80 °C
Relative humidity, operating	10 ... 95 %
Max. installation altitude	2 000 m

Mechanical

3RU2126-1CJ0 — Mechanical
Parameter	Value
Width	45 mm
Height	85 mm
Depth	85 mm

Product details

Motor protection with Class 10 trip curve

The Siemens 3RU2126-1CJ0 is a SIRIUS thermal overload relay designed to protect motors against overload and phase failure.

Auxiliary contact ratings across voltages

These ratings let the relay signal a trip to a PLC input or a holding circuit across common control voltages without an interposing relay.

Size S0 — 45 mm wide, 85 mm deep, 85 mm tall — mounts directly onto the matching SIRIUS contactor via the contactor-mounting fastening method, saving DIN-rail space. The ring cable lug connection on the main circuit handles up to M4 screw terminals.

Frequently asked questions

Where can I buy the 3RU2126-1CJ0 and get a price?

The 3RU2126-1CJ0 is available through independent distribution. Submit an RFQ for current pricing and lead time on your required quantity.

What does the 'for message Tripped' note mean on the 3RU2126-1CJ0?

The note indicates that the auxiliary contact position corresponds to the tripped state — the normally-closed contact opens when the relay trips, providing a positive signal to the control system.