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3RT20361KB40
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Siemens 3RT20361KB40 Contactor 70A 24VDC | IEC 60947 Electromechanical

MPN3RT20361KB40Compare · similar
Active · In production

The Siemens 3RT20361KB40 is a SIRIUS 3RT2-series S2-frame contactor rated 70A per pole for AC-3 motor switching up to 690VAC with a 24VDC coil. Three normally-open power poles serve the load; one integrated 1NO auxiliary contact delivers run or overload status feedback to a PLC input or safety relay. Chassis or DIN-rail mounting with screw terminals covers both new panel-build assemblies and legacy 3RT1 retrofit scen

PackagingBulk
Volume pricing1+ $310.18000
StockOut of Stock
Datasheet

Specifications

3RT20361KB40 Technical Specifications - Column 1
ParameterValue
Series3RT2
MountingChassis Mount, DIN Rail
Rohs StatusROHS3 Compliant
Coil Voltage24VDC
Operate Time80 ms
Coil Resistance26.8Ohms
Termination StyleScrew Terminal
Operating temperature25°C ~ 60°C
3RT20361KB40 Technical Specifications - Column 2
ParameterValue
FeaturesAuxiliary Contacts
Coil Power21.5W
Coil Current895.8 mA
Contact Form3PST-NO (3 Form A)
Release Time55 ms
Switching Voltage690VAC - Max
Must Operate Voltage19.2 VDC
Contact Rating (current)70 A

Product details

Siemens 3RT20361KB40: 70A S2 Contactor for 24VDC Motor Control

The 3RT20361KB40 delivers a verified 70A contact rating across three power poles at up to 690VAC, driven by a 24VDC coil drawing 895.8 mA (coil resistance 26.8 Ohms). Must-operate voltage is 19.2 VDC; operate and release times are 80 ms and 55 ms respectively. Operating temperature range spans 25°C to 60°C. ROHS3 Compliant and REACH Unaffected status is documented; ECCN is EAR99 under HTSUS 8536.41.0045.

Pin-compatible base product number 3RT2036 anchors this MPN within the SIRIUS 3RT2 family. Panel builders substituting 3RT1-generation contactors can verify mechanical footprint and DIN-rail clip geometry against the datasheet before ordering.

Auxiliary contact configuration: one normally-open (1NO) contact feeds status signals to a PLC input, overload relay, or safety controller. Engineers specifying additional safety feedback paths should cross-reference the 1NO+1NC variant 3RT20361KB401AA0 or the 2NO+2NC variant 3RT20361KB44 within the same base number series.

Quick read: on-page parameter snapshot

  • Coil Voltage: 24VDC
  • Coil Current: 895.8 mA

Key Selection Data

  • Coil: 24VDC, 21.5W, 895.8 mA, 26.8 Ohms
  • Must-operate voltage: 19.2 VDC
  • Contact rating: 70 A per pole (3PST-NO)
  • Switching voltage: 690VAC maximum
  • Operate / release time: 80 ms / 55 ms
  • Operating temperature: 25°C to 60°C
  • Mounting: Chassis or DIN Rail, screw terminal
  • Package: Bulk (MOQ 1)

Procurement Notes

Alternative MPNs in This Series

Engineer's notes — electrical baseline

For siemens 3RT20361KB40 (CONTACTOR S2 50A 24VDC SCREW 1NO); category path: Relays > Contactors (Electromechanical); confirmed specs: series: 3RT2; Mounting Type: Chassis Mount, DIN Rail; Package: Bulk; Product Status: Active, anchor electrical decisions to the normalized key-values above—especially supply class, I/O style, and thermal/enclosure assumptions—before you freeze a BOM line.

Field notes for cabinet wiring checks

Commissioning should re-verify mechanical fit, torque specs, connector families, and field cable dress against the drawings; raw specs do not replace an on-site walk-through.

Selection notes — BOM and electrical class

Any part change starts with identical electrical interfaces and mechanical envelope on paper; treat any change in counts, ranges, or package style as a formal re-validation — never a casual swap.

What buyers are searching for

IEC 60947 electromechanical contactor with 24VDC coil for AC-3 motor feeder; UL listed industrial contactor 3-phase; pin-compatible SIRIUS 3RT2 contactor for 3RT1 replacement; contactor mechanical life vs electrical life data; panel builder quantity lead time for 10–100 units

Engineering notes

  • Coil draw 895.8 mA at 24VDC; confirm PLC output module rating can source this current without derating
  • Must-operate voltage 19.2 VDC leaves 4.8 VDC margin from 24VDC supply; useful for long cable runs to field cabinets
  • Operate time 80 ms and release time 55 ms affect PLC scan cycle timing for motor status acknowledgment
  • 3RT2036 base product number enables footprint verification for 3RT1 legacy replacement without re-drilling panel

When to choose this part

  • 70A contact rating exceeds typical AC-3 full-load current for 22 kW DOL at 400V; verify motor FLA against contactor derating curves at operating voltage
  • 1NO auxiliary contact feeds PLC status; if overload relay coil also requires a NO contact, wire both in parallel or upgrade to 1NO+1NC variant 3RT20361KB401AA0
  • DIN rail mounting aligns with standard control cabinet layouts; chassis mount option covers custom enclosures without rail
  • S2 frame size in title indicates 50A AC-3 rating; normalized specs show 70A contact rating—datasheet clarifies which rating applies to your motor duty

Limitations & things to verify

  • Contact rating 70A vs S2-frame title 50A creates ambiguity; datasheet clarifies AC-3 versus AC-1 rating context
  • No mechanical or electrical endurance cycles listed in evidence; lifecycle data requires full datasheet review
  • Operating temperature upper limit 60°C may restrict use in sealed cabinets without active cooling
  • Auxiliary contact count is limited to 1NO; multiple status signals require selecting a different MPN variant

Frequently asked questions

Is the 3RT20361KB40 still in active production today?

Product Status is listed as Active in the evidence table. Panel builders and field engineers can proceed without obsolete-parts risk.

What is the closest pin-compatible alternative to the 3RT20361KB40 in this Contactors (Electromechanical) family?

The 3RT20361KB401AA0 shares the 3RT2036 base number, 24VDC coil, 21.5W power, and 690VAC switching voltage but carries a 51A contact rating (not 70A) and adds one NC auxiliary contact. The 3RT20361KB443MA0 shares the 51A rating and adds a second NO auxiliary contact instead. Both are SIRIUS-series Active MPNs with Box packaging. Confirm contact rating and auxiliary polarity match your circuit requirements.

What compliance documentation does Siemens provide for the 3RT20361KB40 (RoHS, REACH, UL, IEC)?

Evidence confirms ROHS3 Compliant and REACH Unaffected status. ECCN is EAR99 under HTSUS 8536.41.0045. Full IEC 60947 switching duty tables and UL certification references require datasheet review. Datasheet URL is present in evidence.

What lead time does the distributor quote for panel-build quantities (10–100 units) of the 3RT20361KB40?

Lead time is not specified in current evidence. 31 units are available via RFQ confirmation with immediate-ship notation. For panel-build orders of 10–100 units, confirm lead time with distributor before committing to production schedule.

How does the 3RT20361KB40 mechanical and electrical life compare across the Contactors (Electromechanical) family?

Mechanical and electrical endurance cycle data is not present in current evidence. The related MPNs share identical operate time (80 ms) and release time (55 ms), suggesting similar drive mechanism. Full lifecycle ratings require review of the Siemens SIRIUS 3RT2 datasheet.

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Technical resources

3RT20361KB40 datasheet
Lifecycle: ActiveRoHS: ROHS3 Compliant