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Siemens 3RT2037-3NB30 — Contactors

Siemens 3RT2037-3NB30 SIRIUS Power Contactor, S2, 20-33V Coi

MPN3RT2037-3NB30
Active

Siemens SIRIUS power contactor, size S2, 3RT2037-3NB30, 20-33 V AC/DC coil, spring-type terminals, 3-pole main contacts, screw and snap-on 35 mm DIN rail mounting.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT2037-3NB30 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-3NB30 — 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 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2037-3NB30 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz2 VA
Rated value @ 50 Hz20 ... 33 V
3RT2037-3NB30 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-3NB30 — 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)
3RT2037-3NB30 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2037-3NB30 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-3NB30 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-3NB30 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm
3RT2037-3NB30 — Specifications
ParameterValue
At AC30 ... 55 ms

Product details

The coil accepts 20-33 V AC or DC, with an inrush peak of 3 A and holding draw of 2 VA at 50 or 60 Hz. Spring-type terminals on the coil reduce wiring time — no screw torque to verify, just strip and insert. Rated switching frequency varies by duty: 800 cycles/hour for AC-1 resistive loads, 700 for AC-3 motor starting, 400 for AC-2 slip-ring motors, and 200 for AC-4 plugging/reversing. That AC-3 figure (700 1/h) tells you it handles frequent conveyor starts without overheating the coil or arc chamber.

Integration Notes

Physical envelope: 114 mm high, 55 mm wide, 130 mm deep. The depth (130 mm) is the dimension that matters most when fitting into shallow enclosures — measure your backpanel clearance before committing. Side clearance of 6 mm and vertical clearance of 10 mm (up, down, forward) satisfy the manufacturer's ventilation and arc-flash spacing. The 60 °C ceiling covers most unventilated panel interiors, but derate switching frequency if ambient pushes above 40 °C — the thermal curve in the full datasheet governs that. Main contacts are 3-pole (3 normally open). An auxiliary switch block is included (yes per spec), so you have a feedback contact for PLC status without adding a separate side-mount.

Frequently asked questions

Where can I buy the 3RT2037-3NB30 and get a price?

This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What are the key ratings of the 3RT2037-3NB30?

It is a SIRIUS power contactor, size S2, with a 20-33 V AC/DC coil. Switching frequency reaches 700 cycles/hour for AC-3 motor duty. The coil draws 2 VA at 50/60 Hz and has spring-type terminals. Operating temperature range is -25 to +60 °C.

MPN
3RT2037-3NB30