The Siemens 3RT2018-2EK61 is a SIRIUS power contactor in Size S00 — the smallest frame in the SIRIUS family, sized for motor loads up to about 7.5 kW at 400 V (AC-3). It measures 45 mm wide by 70 mm tall by 73 mm deep, fitting a single 45 mm DIN-rail slot. The coil terminals are spring-type (push-in), accepting solid or stranded wire from 0.5 to 4 mm², and up to 2x (0.5 to 4 mm²) per clamp. An integrated auxiliary switch is included, rated for 10 A at 24 V, 2 A at 48 V, 1 A at 110 V, 0.3 A at 220 V, and 3 A at 400 V — covering most control-voltage levels in a single block. Maximum switching frequency varies by duty: 1000 ops/h for AC-1 (resistive), 750 ops/h for AC-2 and AC-3 (motor starting), and 250 ops/h for AC-4 (plugging/inching). Coil power loss is 0.24 W at both 50 and 60 Hz.
Siemens 3RT2018-2EK61 SIRIUS Power Contactor, Size S00, 45 m
MPN3RT2018-2EK61
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Siemens SIRIUS power contactor, Size S00, 3RT2018-2EK61, 45 mm width, spring-type terminals, 73 mm depth, AC-3 750 ops/h, current production.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Contactor frame size | S00 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated operational current, AC-4 @ 400 V | 11.5 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 2 A |
| Rated value @ 690 V | 1 A |
| Rated value @ 230 V | 2 hp |
| Rated value @ 24 V | 10 A |
| Rated value @ 60 V | 2 A |
| Rated value @ 110 V | 1 A |
| Rated value @ 220 V | 0.3 A |
| Parameter | Value |
|---|---|
| Control supply voltage type | AC |
| Rated value @ 50 Hz | 0.24 |
| Rated value @ 50 Hz | 110 V |
| Parameter | Value |
|---|---|
| Main poles | 3 |
| Main NO contacts | 3 |
| Auxiliary contact reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Parameter | Value |
|---|---|
| Short-circuit coordination type 1, fuse | gG: 50A (690V,100kA), aM: 25A (690V,100kA), BS88: 50A (415V,80kA) |
| Short-circuit coordination type 2, fuse | gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA) |
| Aux. switch short-circuit protection, fuse | gG: 10 A (500 V, 1 kA) |
| Parameter | Value |
|---|---|
| Main circuit connection | spring-loaded terminals |
| Aux. / control circuit connection | spring-loaded terminals |
| Conductor cross-section, solid | 0.5 ... 4 mm² |
| Conductor cross-section, solid or stranded | 2x (0,5 ... 4 mm²) |
| Conductor cross-section, finely stranded w/ ferrule | 2x (0.5 ... 2.5 mm²) |
| Mounting method | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715 |
| Side-by-side mounting | Yes |
| Parameter | Value |
|---|---|
| Durability (operating cycles, typ.) | 30 000 000 |
| Durability with aux. switch block (cycles, typ.) | 10 000 000 |
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +60 °C |
| Storage temperature range | -55 ... +80 °C |
| Installation altitude, max. | 2 000 m |
| Parameter | Value |
|---|---|
| Width | 45 mm |
| Height | 70 mm |
| Depth | 73 mm |
| Parameter | Value |
|---|---|
| At AC | 4 ... 15 ms |
Product details
Frequently asked questions
Who supplies 3RT2018-2EK61 and how is it quoted for volume purchases?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
What is 3RT2018-2EK61's listed depth?
The depth is 73 mm.
What wire sizes does the spring terminal accept?
Solid or stranded wire from 0.5 to 4 mm², and up to 2x (0.5 to 4 mm²) per clamp.
What is the maximum switching frequency for AC-3 duty?
750 operations per hour for AC-3 (motor starting).
MPN
3RT2018-2EK61