Siemens 3RT2026-1AG20 – 3-Pole Power Contactor for Motor Control | SIRIUS 3RT Platform
The Siemens 3RT2026-1AG20 is a 3-pole AC power contactor from the globally trusted SIRIUS 3RT series, engineered for reliable motor switching and load control in demanding industrial environments. With a rated operational current of 25A at AC-3 and a 110V AC (50/60 Hz) control coil, this contactor delivers consistent performance across a wide range of automation and power distribution applications.
Designed for panel builders, OEM machine manufacturers, and MRO procurement engineers who require a proven, standards-compliant switching device with long mechanical life and compact DIN-rail footprint.
Complete Technical Specifications
- Part Number / SKU: 3RT2026-1AG20
- Manufacturer: Siemens AG
- Series: SIRIUS 3RT2 (Size S0)
- Pole Configuration: 3-pole (3NO main contacts)
- Rated Operational Current (AC-3): 25 A
- Rated Power (AC-3, 400V): 11 kW
- Rated Power (AC-3, 690V): 15 kW
- Control Coil Voltage (Us): 110 V AC, 50/60 Hz
- Auxiliary Contacts: 1NO + 1NC (integrated)
- Rated Insulation Voltage (Ui): 690 V
- Rated Impulse Withstand Voltage (Uimp): 6 kV
- Mechanical Endurance: ≥ 10 million operations
- Electrical Endurance (AC-3): ≥ 1 million operations
- Mounting: DIN rail (EN 60715) or screw mounting
- Degree of Protection: IP20 (terminals IP00)
- Ambient Temperature: -25°C to +60°C (storage: -60°C to +80°C)
- Weight: approx. 400 g
- Dimensions (W × H × D): 45 × 78 × 90 mm (Size S0)
- Connection Type: Screw terminals
Proven Application Environments
- Motor Starter Panels: Direct-on-line (DOL) and reversing starter circuits for pumps, fans, compressors, and conveyors up to 11 kW / 400V.
- HVAC Systems: Chiller compressor switching, AHU fan control, and cooling tower motor management.
- Water & Wastewater Treatment: Submersible pump control, dosing pump automation, and blower motor switching.
- Food & Beverage Processing: Conveyor drive control, mixer motor switching, and packaging line automation.
- Building Automation (BAS/BMS): Lighting contactor banks, elevator motor control, and escalator drive panels.
- Oil & Gas Upstream: Wellhead pump motor control, gas compressor auxiliary circuits, and skid-mounted MCC panels.
- Machine Tool & OEM Equipment: CNC spindle motor switching, hydraulic power unit (HPU) control, and robotic cell auxiliary power.
Engineering Advantages
- Compact Size S0 Footprint: 45 mm width enables high-density panel layouts, reducing enclosure size and material cost.
- Integrated 1NO+1NC Auxiliary: Eliminates add-on auxiliary contact blocks in standard motor starter configurations.
- Wide Coil Voltage Tolerance: Operates reliably at 0.85–1.1× Us, ensuring stable pick-up and drop-out under real-world voltage fluctuations.
- Modular Expansion: Accepts add-on auxiliary contact blocks (3RH2911), surge suppressors (3RT2916), and mechanical interlocks (3RA1921) without rewiring.
- IEC & UL Dual Certification: Simplifies export compliance for European and North American markets.
- Long Service Life: 10 million mechanical operations reduce unplanned downtime and lifecycle replacement costs.
System Architecture & Signal Flow
In a typical DOL motor starter circuit, the 3RT2026-1AG20 sits at the power switching stage between the upstream circuit breaker (e.g., Siemens 3RV2 motor protection circuit breaker) and the motor terminals. The 110V AC control coil is energized by the PLC digital output or control relay, closing the three main contacts and connecting the motor to the three-phase supply. The integrated 1NC auxiliary feeds back a “contactor open” signal to the PLC input for interlock logic, while the 1NO auxiliary can drive a run-status indicator lamp or seal-in circuit.
Recommended upstream protection: Siemens 3RV2021 (motor protection circuit breaker, Size S0, up to 25A) — direct coupling without adapter required.
Sourcing & Quality Verification
- All units sourced through authorized Siemens distribution channels or verified surplus with full traceability documentation.
- Each unit inspected for: original Siemens holographic label, correct date code, undamaged arc chutes, and coil continuity test.
- Counterfeit risk mitigation: serial number cross-referenced against Siemens PLM database where applicable.
- Packaging: original Siemens retail box or anti-static ESD bag with foam insert for surplus units.
- Certificate of Conformity (CoC) available upon request for regulated industries.
Procurement Process
- Confirm your coil voltage requirement — suffix -1AG20 = 110V AC, 50/60 Hz. For other voltages (24V DC: -1HB4, 230V AC: -1AP00), contact us before ordering.
- Submit your RFQ via the product page or email support@konmask.com with quantity and required delivery date.
- Receive quotation within 1 business day including unit price, lead time, and shipping options.
- Order confirmation & payment — T/T, PayPal, and trade assurance accepted.
- Dispatch & tracking — orders ship within 3–5 business days; expedited available for urgent MRO requirements.
Technical FAQ
Q: Can the 3RT2026-1AG20 be used for star-delta (Y-Δ) starting?
A: Yes, in a 3-contactor Y-Δ starter configuration. You will need three 3RT2026 units plus a Siemens 3RA1 combination starter kit. Ensure mechanical and electrical interlocking between star and delta contactors.
Q: What is the maximum motor power this contactor can switch?
A: 11 kW at 400V (AC-3 duty). At 690V, up to 15 kW. For AC-1 (resistive loads), the rated current is 32A.
Q: Is the 3RT2026-1AG20 compatible with Siemens 3RV2 motor protection circuit breakers?
A: Yes. The Size S0 frame directly couples to the 3RV2021 without an adapter, forming a compact combination motor starter.
Q: Can I add a surge suppressor to protect the coil circuit?
A: Yes. The Siemens 3RT2916-1BB00 (RC element) or 3RT2916-1CB00 (varistor) snaps directly onto the coil terminals without additional wiring.
Q: What certifications does this contactor carry?
A: IEC/EN 60947-4-1, CE marking, UL 508, CSA C22.2 No. 14. Suitable for use in ATEX Zone 2 control panels when installed per Siemens application guidelines.
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