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Siemens 3RT2037-1NB36 — Contactors

Siemens 3RT2037-1NB36 SIRIUS Power Contactor, 20-33 VDC Coil

MPN3RT2037-1NB36
Active

Siemens SIRIUS power contactor, Size S2, 3RT2037-1NB36, 20-33 VDC coil, screw-type terminals, 3-pole main contacts.

Siemens 3RT2037-1NB36 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2037-1NB36 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-1NB36 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V55 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V10 hp
Rated value @ 24 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2037-1NB36 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz2 VA
Rated value @ 50 Hz20 ... 33 V
3RT2037-1NB36 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-1NB36 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)
Short-circuit coordination type 2, fusegG: 125A (690V,100kA), aM: 63A (690V,100kA), BS88: 100A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2037-1NB36 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2037-1NB36 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-1NB36 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-1NB36 — Mechanical
ParameterValue
Width75 mm
Height114 mm
Depth130 mm
3RT2037-1NB36 — Specifications
ParameterValue
At AC30 ... 55 ms

Product details

It carries a 20-33 VDC coil and three main poles — the contact configuration is 18 to 1. The coil draws a 3 A inrush peak, then holds at 6 A at 24 V rated value, dropping to 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V — so the holding power is low, but the inrush matters for the DC supply sizing. Switching rates vary by duty: up to 800 operations per hour in AC-1 (resistive), 700 in AC-3 (motor start/run), 400 in AC-2 (slip-ring motor), and 200 in AC-4 (plugging/inching). The AC-3e rate matches AC-3 at 700 1/h.

Dimensions: 114 mm high, 75 mm wide, 130 mm deep. Coil terminals are screw-type, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. No auxiliary switch block is included as standard.

Frequently asked questions

What is 3RT2037-1NB36's listed depth and width?

The depth is 130 mm and the width is 75 mm, with a height of 114 mm.

Will 3RT2037-1NB36 drop into a panel that was specified around 3RT2015-1BW42 without rewiring?

The 3RT2037-1NB36 is a Size S2 frame, while the 3RT2015-1BW42 is a smaller Size S0 frame. The footprint and mounting hole pattern differ, so it will not drop in without panel modifications. Check the terminal layout and coil voltage compatibility before substituting.

MPN
3RT2037-1NB36