Thermal Overload Relay Engineering Guide
A senior-engineer guide to thermal overload relays: bimetallic vs electronic construction, trip classes, FLC dial setting, star-delta sizing, phase-loss and ambient compensation, reset modes,...
- Part number
- 3RU2146-4MB1
- Model no
- 3RU2
In stock · 50+
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· From Türkiye
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3RU2Siemens 3RU2146-4MB1 3RU2 80...100A 3P 1000V Thermal Overload Relay
Description
About the 3RU2
About the 3RU2
The Siemens 3RU2146-4MB1 is a thermal overload relay from the SENTRON/SIRIUS 3RU2 series. Overload relay 80...100 A Thermal For motor protection Size S3, Class 10 Stand-alone installation Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset. Supplied by Stoklink for industrial and commercial low-voltage applications.
Applications & Use Cases
The Siemens 3RU2146-4MB1 is used in industrial control panels, distribution boards and automation systems. As part of the Siemens 3RU2 range it integrates with compatible SENTRON/SIRIUS components for a coordinated low-voltage installation. Genuine Siemens product supplied by Stoklink with fast dispatch from Türkiye.
Specification
Full specification
General 3
| product brand name | SIRIUS |
|---|---|
| product designation | thermal overload relay |
| product type designation | 3RU2 |
General technical data 14
| size of overload relay | S3 |
|---|---|
| size of contactor can be combined company-specific | S3 |
| power loss [W] for rated value of the current at AC in hot | 21 W |
| operating state: per pole | 7 W |
| type of calculation of power loss current-dependent | quadratic |
| insulation voltage with degree of pollution 3 at AC rated value | 1 000 V |
| surge voltage resistance rated value | 8 kV |
| maximum permissible voltage for protective separation: in networks with ungrounded star point between auxiliary and auxiliary circuit | 440 V |
| shock resistance according to IEC 60068-2-27 | 8g / 11 ms |
| recovery time after overload trip: with automatic reset typical | 10 min |
| recovery time after overload trip: with remote-reset | 10 min |
| recovery time after overload trip: with manual reset | 10 min |
| reference code according to IEC 81346-2 | F |
| Substance Prohibitance (day/month/year) | 03/01/2017 |
Ambient conditions 6
| 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 % |
Show all 109 specifications ↓ Show less ↑86 more values in Identification, Main circuit, Auxiliary circuit, Protective and monitoring functions, UL/CSA ratings, Short-circuit protection, Installation/ mounting/ dimensions, Connections/ Terminals, Safety related data, IEC 61508, Electrical Safety, Display, Logistics.
Identification 10
| Part number | 3RU2146-4MB1 |
|---|---|
| Type designation | 3RU2 |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4047621012964 |
| ETIM class | EC000106 |
| eCl@ss | 27371501 |
Main circuit 13
| number of poles for main current circuit | 3 |
|---|---|
| adjustable current response value current of the current-dependent overload release | 80 ... 100 A |
| operating voltage: rated value | 1 000 V |
| operating voltage: at AC-3e rated value maximum | 1 000 V |
| operating frequency rated value | 50 ... 60 Hz |
| operational current rated value | 100 A |
| operational current at AC-3e at 400 V rated value | 100 A |
| at AC-3: at 400 V rated value | 45 kW |
| at AC-3: at 500 V rated value | 55 kW |
| at AC-3: at 690 V rated value | 90 kW |
| at AC-3e: at 400 V rated value | 45 kW |
| at AC-3e: at 500 V rated value | 55 kW |
| at AC-3e: at 690 V rated value | 90 kW |
Auxiliary circuit 19
| design of the auxiliary switch | integrated |
|---|---|
| number of NC contacts for auxiliary contacts | 1 |
| note | for contactor disconnection |
| number of NO contacts for auxiliary contacts | 1 |
| 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 |
| design of the miniature circuit breaker for short-circuit protection of the auxiliary switch required | 6A (SCC less than equal to 0.5 kA; U less than equal to 260V) |
| contact rating of auxiliary contacts according to UL | B600 / R300 |
Protective and monitoring functions 2
| trip class | CLASS 10 |
|---|---|
| design of the overload release | thermal |
UL/CSA ratings 2
| full-load current (FLA) for 3-phase AC motor: at 480 V rated value | 96 A |
|---|---|
| full-load current (FLA) for 3-phase AC motor: at 600 V rated value | 99 A |
Short-circuit protection 2
| for short-circuit protection of the main circuit: with type of coordination 1 required | 690 V: gG: 250 A; 1000 V: a.M. / g.B.: 200 A |
|---|---|
| for short-circuit protection of the main circuit: for short-circuit protection of the auxiliary switch required | fuse gG: 6 A, quick: 10 A |
Installation/ mounting/ dimensions 5
| 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 | 120 mm |
| width | 70 mm |
| depth | 140 mm |
Connections/ Terminals 20
| product component removable terminal for auxiliary and control circuit | No |
|---|---|
| type of electrical connection: for main current circuit | screw-type terminals |
| type of electrical connection: for auxiliary and control circuit | screw-type terminals |
| arrangement of electrical connectors for main current | Top and bottom |
| for main contacts: solid | 2x (2.5 ... 16 mm2) |
| for main contacts: stranded | 2x (6 ... 16 mm2), 2x (10 ... 50 mm2), 1x (10 ... 70 mm2) |
| for main contacts: solid or stranded | 2x (2,5 ... 50 mm2), 1x (10 ... 70 mm2) |
| for main contacts: finely stranded with core end processing | 2x (2.5 ... 35 mm2), 1x (2.5 ... 50 mm2) |
| for main contacts: for AWG cables for main contacts | 2x (10 ... 1/0), 1x (10 ... 2/0) |
| for auxiliary contacts: solid or stranded | 2x (0.5 ... 1.5 mm2), 2x (0.75 ... 2.5 mm2) |
| for auxiliary contacts: finely stranded with core end processing | 2x (0.5 ... 1.5 mm2), 2x (0.75 ... 2.5 mm2) |
| for auxiliary contacts: for AWG cables for auxiliary contacts | 2x (20 ... 16), 2x (18 ... 14) |
| tightening torque: for main contacts for ring cable lug | 4.5 ... 6 N·m |
| outer diameter of the usable ring cable lug maximum | 19 m |
| tightening torque: for main contacts with screw-type terminals | 4.5 ... 6 N·m |
| tightening torque: for auxiliary contacts with screw-type terminals | 0.8 ... 1.2 N·m |
| design of screwdriver shaft | Hexagonal socket |
| size of the screwdriver tip | 4 mm hexagon socket |
| design of the thread of the connection screw: for main contacts | M8 |
| design of the thread of the connection screw: of the auxiliary and control contacts | M3 |
IEC 61508 1
| T1 value: for proof test interval or service life according to IEC 61508 | 20 a |
|---|
Electrical Safety 2
| 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 1
| display version for switching status | Slide switch |
|---|
Logistics 7
| Net weight | 0.767 kg |
|---|---|
| Package dimensions | 129 × 93 × 154 mm |
| Country of origin | DE |
| Shipping weight | 1.267 kg |
| Ships from | Türkiye |
| Dispatch | 11 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 31 Oct 2026
Documents
Documents for 3RU2146-4MB1
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Quick answers
Questions about the 3RU2
What is the rated current of 3RU2?
The rated current of 3RU2 is 100 A.
Which supply voltage is 3RU2 rated for?
The rated operational voltage of 3RU2 is 1000 V AC.
What is the EAN of 3RU2?
The EAN (GTIN) of 3RU2 is 4047621012964.
Where does 3RU2 ship from, and how fast?
3RU2 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
Guides
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Series
Siemens 3RU2
- Brand
- Siemens
- Series
- 3RU2
