Siemens 3RT2036-1KB40 SIRIUS Power Contactor 50A AC-3, wide-range AC/DC (per coil code) Coil

The Siemens 3RT2036-1KB40 is a 3-pole SIRIUS power contactor from the 3RT2036 series, rated 50 A in utilisation category AC-3 (70 A in AC-1) and capable of switching three-phase motors up to 40 HP at 460 V. Built on the compact S2 frame size at just 55 mm wide with screw terminals and a wide-range AC/DC (per coil code) control coil, it is a workhorse component for motor control centres and packaged equipment supplied across Saudi Arabia by Razz Middle East.

Technical Overview

The 3RT2036-1KB40 belongs to Siemens' fourth-generation SIRIUS 3RT2 modular contactor system, engineered to IEC 60947-4-1. Its silver-alloy main contacts and positively-driven mirror auxiliary contacts deliver high electrical endurance and reliable interlocking. The wide-range AC/DC (per coil code) coil draws minimal holding power, and on AC variants an integrated electronic coil economy circuit reduces heat dissipation inside the panel — an important advantage in the high ambient temperatures of Gulf switchrooms. A standardised accessory interface accepts surge suppressors, auxiliary blocks and the matching 3RU2/3RB3 overload relays to form a complete direct-on-line starter without additional wiring.

Performance & Specifications

Rated operational current is 50 A (AC-3, up to 415 V) and 70 A (AC-1), supporting motors to 40 HP / approximately 20 kW at 400-460 V. The S2 frame measures 55 mm in width with a unit weight of about 0.95 kg, and the device operates from -25 °C to +60 °C. Rated insulation voltage is 690 V with an IP20 finger-safe terminal design, and mechanical endurance reaches 10 million operating cycles.

Applications in Saudi Arabia

Across the Kingdom the 3RT2036-1KB40 switches motor loads in oil & gas, water and petrochemical plant. Typical deployments include centrifugal pump starters at NWC and SWCC desalination and water-transmission stations, fan and blower control in SABIC and Sipchem petrochemical units in Jubail, conveyor and crusher drives at MAADEN mining and cement operations, and HVAC and utility motors on NEOM and Red Sea Project construction packages. Its 55 mm width allows high-density MCC bucket layouts in Dammam and Riyadh assembly shops, while the wide-range AC/DC (per coil code) coil supports both classic relay logic and PLC-direct control.

Installation & Integration

The 3RT2036-1KB40 mounts on standard 35 mm DIN rail or by screw fixing and integrates directly with the SIRIUS 3RU2 thermal overload relays and 3RV2 motor-protection circuit breakers to form fully coordinated, type-tested direct-on-line and reversing starters. Box terminals accept a wide conductor range for both fine-stranded and solid copper, and the finger-safe IP20 design supports safe live working in crowded motor control centres. Link modules and busbar adapters allow rapid assembly of multi-starter groups, while the standardised front interface accepts auxiliary contact blocks, surge suppressors and timing relays — letting Razz Middle East's customers in Dammam and Jubail build complete, documented motor branch circuits from a single compatible SIRIUS platform.

Standards, Quality & Compliance

Every 3RT2036-1KB40 supplied by Razz Middle East is a genuine Siemens product, manufactured under ISO 9001 quality management and conforming to the relevant IEC 60947 standards with international CE and UL approvals. Sourcing through an authorized channel guarantees correct datecodes, factory documentation and full warranty cover — a critical safeguard on safety-related motor control and protection equipment, where counterfeit components present a real risk to plant and personnel. For ARAMCO, SABIC, MAADEN, NWC and NEOM contractors operating under strict approved-vendor and traceability regimes, this assurance shortens technical and commercial evaluation and keeps projects on schedule. Razz Middle East backs each delivery with selection support, cross-referencing from competitor part numbers and documented lead times.

Why Choose Razz Middle East for Siemens Products

Razz Middle East supplies the genuine, factory-sealed Siemens 3RT2036-1KB40 as an authorized channel for Siemens industrial control products in the Kingdom of Saudi Arabia. Every contactor ships with full manufacturer documentation and traceability, protecting your facility from counterfeit risk on safety-critical equipment. Our technical desk responds to RFQs within four working hours, and we hold local stock in Dammam and Riyadh with onward delivery to Dammam, Jubail, Riyadh, Jeddah and Yanbu. Whether you are sourcing a single replacement for an unplanned shutdown or standardising a complete motor control centre, our team supports selection, cross-referencing and lead-time planning for ARAMCO, SABIC, MAADEN, SWCC/NWC and NEOM contractors across the Kingdom.