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Siemens 3RU2126-4DC1

Overload relay 20...25 A thermal for motor protection frame size S0

MPN: 3RU2126-4DC1
Category: SIRIUS 3RU2 thermal overload relays

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What is the Siemens 3RU2126-4DC1?

overload relay 20...25 A thermal for motor protection frame size S0, Class 10 stand-alone installation main circuit: spring-loaded terminal auxiliary circuit: spring-loaded terminal manual-automatic RESET

Specifications

General

product brand name	SIRIUS
product designation	thermal overload relay
product type designation	3RU2

General technical data

size of overload relay	S0
size of contactor can be combined company-specific	S0
power loss [W] for rated value of the current at AC in hot operating state	8.1 W
power loss [W] for rated value of the current at AC in hot operating state — per pole	2.7 W
type of calculation of power loss current-dependent	quadratic
insulation voltage with degree of pollution 3 at AC rated value	690 V
surge voltage resistance rated value	6 kV
maximum permissible voltage for protective separation — in networks with ungrounded star point between auxiliary and auxiliary circuit	440 V
maximum permissible voltage for protective separation — in networks with grounded star point between auxiliary and auxiliary circuit	440 V
maximum permissible voltage for protective separation — in networks with ungrounded star point between main and auxiliary circuit	440 V
maximum permissible voltage for protective separation — in networks with grounded star point between main and auxiliary circuit	440 V
shock resistance according to IEC 60068-2-27	8g / 11 ms
reference code according to IEC 81346-2	F
Substance Prohibitance (day/month/year)	10/01/2009
Net Weight	0.278 kg

Ambient conditions

installation altitude at height above sea level maximum	2 000 m
ambient temperature — during operation	-40 ... +70 °C
ambient temperature — during storage	-55 ... +80 °C
ambient temperature — during transport	-55 ... +80 °C
temperature compensation	-40 ... +60 °C
relative humidity during operation	10 ... 95 %

Main circuit

number of poles for main current circuit	3
adjustable current response value current of the current-dependent overload release	20 ... 25 A
operating voltage — rated value	690 V
operating voltage — at AC-3e rated value maximum	690 V
operating frequency rated value	50 ... 60 Hz
operational current rated value	25 A
operational current at AC-3e at 400 V rated value	25 A
operating power — at AC-3 — at 400 V rated value	11 kW
operating power — at AC-3 — at 500 V rated value	15 kW
operating power — at AC-3 — at 690 V rated value	22 kW
operating power — at AC-3e — at 400 V rated value	11 kW
operating power — at AC-3e — at 500 V rated value	15 kW
operating power — at AC-3e — at 690 V rated value	22 kW

Auxiliary circuit

design of the auxiliary switch	integrated
number of NC contacts for auxiliary contacts	1
number of NC contacts for auxiliary contacts — note	for contactor disconnection
number of NO contacts for auxiliary contacts	1
number of NO contacts for auxiliary contacts — 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
operational current of auxiliary contacts at AC-15 — at 110 V	3 A
operational current of auxiliary contacts at AC-15 — at 120 V	3 A
operational current of auxiliary contacts at AC-15 — at 125 V	3 A
operational current of auxiliary contacts at AC-15 — at 230 V	2 A
operational current of auxiliary contacts at AC-15 — at 400 V	1 A
operational current of auxiliary contacts at AC-15 — at 690 V	0.75 A
operational current of auxiliary contacts at DC-13 — at 24 V	2 A
operational current of auxiliary contacts at DC-13 — at 60 V	0.3 A
operational current of auxiliary contacts at DC-13 — at 110 V	0.22 A
operational current of auxiliary contacts at DC-13 — at 125 V	0.22 A
operational current of auxiliary contacts at DC-13 — at 220 V	0.11 A
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	25 A
full-load current (FLA) for 3-phase AC motor — at 600 V rated value	25 A

Short-circuit protection

design of the fuse link — for short-circuit protection of the auxiliary switch required

fuse gG: 6 A, quick: 10 A

Installation/ mounting/ dimensions

mounting position	stand-alone installation: with a vertical mounting plane +/-135° rotatable and +/-45° tiltable; for more details see manual
fastening method	stand-alone installation
height	114 mm
width	45 mm
depth	95 mm

Connections/ Terminals

product component removable terminal for auxiliary and control circuit	No
type of electrical connection — for main current circuit	spring-loaded terminals
type of electrical connection — for auxiliary and control circuit	spring-loaded terminals
arrangement of electrical connectors for main current circuit	Top and bottom
type of connectable conductor cross-sections — for main contacts — solid or stranded	1x (1 ... 10 mm²)
type of connectable conductor cross-sections — for main contacts — finely stranded with core end processing	1x (1 ... 6 mm²)
type of connectable conductor cross-sections — for main contacts — finely stranded without core end processing	1x (1 ... 6 mm²)
type of connectable conductor cross-sections — for AWG cables for main contacts	1x (18 ... 8)
type of connectable conductor cross-sections — for auxiliary contacts — solid or stranded	2x (0.5 ... 2.5 mm²)
type of connectable conductor cross-sections — for auxiliary contacts — finely stranded with core end processing	2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
type of connectable conductor cross-sections — for auxiliary contacts — finely stranded without core end processing	2x (0.5 ... 1.5 mm²)
type of connectable conductor cross-sections — for AWG cables for auxiliary contacts	2x (20 ... 14)
design of screwdriver shaft	Diameter 3 mm
size of the screwdriver tip	3,0 x 0,5 mm

Safety related data

failure rate [FIT] with low demand rate according to SN 31920	50 FIT
MTTF with high demand rate	2 280 a
T1 value — for proof test interval or service life according to IEC 61508	20 a
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

Approvals Certificates

global warming potential [CO2 eq] / during manufacturing	2.02 kg
global warming potential [CO2 eq] / during sales	0.0761 kg
global warming potential [CO2 eq] / during operation	65.6 kg
global warming potential [CO2 eq] / after end of life	-0.0711 kg
global warming potential [CO2 eq] / total	67.7 kg

Downloads & documentation

Official documents from Siemens, downloaded directly from the manufacturer.

Data sheets & manuals

Product data sheet 3RU2126-4DC1PDF

3RU2126-4DC1: frequently asked questions

When can 3RU2126-4DC1 be shipped?

3RU2126-4DC1 is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up 3RU2126-4DC1 in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for 3RU2126-4DC1 and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for 3RU2126-4DC1, subject to availability and destination.