Siemens Overload relay for motor protection, size S00, 2.2 - 3.2A Part number 3RU2116-1DB1

Product Overview

The Siemens 3RU2116-1DB1 is a thermal overload relay from the SIRIUS 3RU2 series (size S00), designed to provide overload and motor-protection for three-phase motors. It offers adjustable thermal overload protection (2.2…3.2 A), supports screw-terminal wiring, includes auxiliary contacts (1 NO + 1 NC) for signaling or control feedback, and is suitable for use with S00-size contactors. It is ideal for motor circuits requiring reliable overload protection and status signalling.

Key Features

• Thermal overload relay, SIRIUS 3RU2 series, size S00
• Adjustable overload release current: 2.2 … 3.2 A
• Supports three-phase motors (3 poles) with operating voltage up to 690 V AC
• Trip class: Class 10 — suitable for standard motor starting loads
• Integrated auxiliary contacts: 1 NO + 1 NC for “tripped” signalling or contactor control
• Screw-terminal connections — both for main and auxiliary circuits
• Both manual and automatic reset possible
• Wide ambient operating temperature range: –40 °C to +70 °C
• Compact dimensions — suitable for control-cabinet or motor-starter assembly

Technical Specifications

• Article Number: 3RU2116-1DB1
• Series: SIRIUS 3RU2, overload relay, size S00
• Number of Poles (Main Circuit): 3
• Adjustable Overload Release Current: 2.2 … 3.2 A
• Rated Operating Voltage: Up to 690 V AC
• Motor Power Rating (AC-3): 1.1 kW at 400 V, 1.5 kW at 500 V, 2.2 kW at 690 V
• Auxiliary Contacts: 1 × NO + 1 × NC
• Auxiliary Contact Ratings (AC-15): up to 3 A (24–125 V), 2 A at 230 V, 1 A at 400 V, 0.75 A at 690 V
• Auxiliary Contact Ratings (DC-13): up to 2 A at 24 V DC; 0.11 A at 220 V DC
• Reset Function: Manual or automatic reset
• Connection Terminals: Screw-type for main and auxiliary circuits
• Connectable Conductor Cross-Section (Main): 0.5–4 mm² (depending on conductor type)
• Mounting: Stand-alone installation (mount next to/with appropriate contactor size S00)
• Ambient Operating Temperature: –40 °C … +70 °C
• Storage / Transport Temperature: –55 °C … +80 °C
• Insulation / Surge Withstand Voltage: 690 V insulation; 6 kV surge withstand
• Dimensional Envelope (approx.): Height 89 mm × Width 45 mm × Depth 80 mm
• Protection Class (front): IP20 (finger-safe, with vertical contact from front)

Compliance & Standards

• Conforms to SIRIUS 3RU2 thermal motor-protection series standards
• Suitable for motor protection per IEC/EN low-voltage motor-protection norms
• Auxiliary contacts suitable for signaling and control circuits under AC and DC loading — compliant with standard AC-15 / DC-13 contact rating norms
• Insulation and surge-voltage ratings compliant with industrial switchgear requirements

Applications

The 3RU2116-1DB1 overload relay is used to protect small to medium three-phase motors (e.g. pumps, fans, conveyors, compressors) against overload and phase-failure currents. It is typically combined with a compatible S00-size contactor to form a complete motor starter. The integrated NO/NC auxiliary contacts allow status feedback or interlock functions — for example warning lights, control signals to PLCs, or automatic disconnection logic upon trip. Its wide ambient temperature range and compact size make it suitable for control-cabinet integration in factories, process plants, HVAC systems, and general industrial automation installations.