Product Overview

In motor control centers (MCCs) and automation panels, the auxiliary contacts of thermal overload relays play a crucial role in transmitting protection status (such as overload tripping and normal operation) to PLCs, DCSs, or alarm systems. However, traditional hardwired connections are not only complex to wire but also time-consuming and laborious to troubleshoot. The ABB 1SVR011718R2500 is a standardized interface solution designed to address this engineering challenge – it is not an independent relay, but a plug-in auxiliary contact module specifically developed for the ABB TA25DU series thermal overload relays, enabling “plug-and-play” signal output and status visualization.

I have led several large-scale MCC upgrade projects for water treatment plants and steel rolling production lines, and I understand the critical importance of quickly diagnosing whether a pump has shut down due to overload in densely packed drawer cabinets. The ABB 1SVR011718R2500, through its integrated dual-color LED indicator on the top (green = normal, red = tripped), allows maintenance personnel to remotely visually determine the equipment status without opening the cabinet door or using a multimeter. Its 2 normally open (2NO) contact design can be used to send a “running” signal to the PLC and can also be connected in parallel to the local alarm circuit for double protection. More importantly, the module adopts ABB’s standardized quick-connect structure, seamlessly interlocking with the TA25DU main body, allowing for installation and removal in just seconds, significantly reducing downtime. This “status transparency + rapid maintenance” design concept makes the ABB 1SVR011718R2500 a key detail in improving maintainability in modern industrial control panels. Technical Specifications
Product Model: 1SVR011718R2500

Manufacturer: ABB Ltd.

Product Type: Plug-in auxiliary contact module (for TA25DU thermal overload relay)

Compatible Main Relay: ABB TA25DU series (0.1–63 A)

Contact Configuration: 2 Normally Open (2NO)

Rated Insulation Voltage Ui: 690 V AC

Rated Operating Voltage Ue: 250 V AC / DC (maximum)

Rated Operating Current Ie: 6 A (AC-15), 3 A (DC-13)

Mechanical Life: ≥ 10⁷ operations

Electrical Life (AC-15, 240 V): ≥ 10⁵ operations

LED Indication: Dual color (green/red), driven by the internal mechanism of the TA25DU

Mounting Method: Directly plugs into the top of the TA25DU relay (no tools required)

Protection Rating: IP20 (when installed in a cabinet with TA25DU)

Certification Standards: IEC 60947-5-1, CE, UL, CSA

Main Features and Advantages

The core value of the ABB 1SVR011718R2500 lies in the operational and maintenance revolution brought about by its “mechatronic state feedback” and “standardized interface”. In traditional solutions, to obtain the status of the TA25DU, engineers had to run wires from the relay body to a terminal block and then connect them to the control system – a cumbersome and error-prone process. This module integrates the contacts and indicator into one unit, directly snapping onto the relay, resulting in the shortest signal path and stronger anti-interference capabilities. Fully compatible with ABB TA25DU thermal overload relays, plug-and-play, no additional wiring required.
Dual-color LED provides real-time relay status indication (green = powered on, not tripped; red = tripped), enhancing on-site visibility.
2NO contacts can be flexibly used for PLC inputs, HMI alarms, interlocking circuits, or remote reset confirmation.
Modular design supports quick replacement without disconnecting the main circuit or control lines.
Complies with IEC 60947 standard, ensuring reliable breaking under inductive loads (such as contactor coils).
Crucially, its contact material uses silver alloy, possessing excellent anti-welding and arc resistance properties, maintaining long-term contact reliability even in frequent switching or low-current signal circuits. This “attention to detail” engineering philosophy is one of the reasons why ABB continues to lead in the low-voltage control field.

The ABB 1SVR011718R2500 is a plug-in auxiliary contact module specifically designed for the ABB TA25DU thermal overload relay family. It provides two normally open (2NO) contacts and integrated dual-color LED indication (green for healthy, red for tripped), enabling immediate visual status feedback without opening control panels. Engineered for seamless integration, it snaps directly onto the TA25DU body, eliminating field wiring for status signals and significantly reducing installation and troubleshooting time. With a rated voltage of 250 V AC/DC and compliance with IEC 60947-5-1, it delivers reliable switching for PLC inputs, alarms, and interlocks in demanding industrial environments. Its modular, tool-free design exemplifies ABB’s commitment to serviceability and operational clarity in motor protection systems.

Application Areas

The ABB 1SVR011718R2500 is widely used in all motor protection scenarios employing ABB TA25DU thermal overload relays, especially suitable for applications requiring high visibility of status and maintenance efficiency. In municipal pumping stations, it clearly displays the running/overload status of each submersible pump; in automotive welding lines, it is used to monitor the protection status of robot servo motors; in HVAC systems, it supports centralized monitoring of fans and cooling towers. Pump control panels (MCCs) for water supply and wastewater treatment plants
Motor drive units for industrial manufacturing automation lines
Fan and pump control for commercial building HVAC systems
Auxiliary equipment protection circuits for energy stations (boiler rooms, refrigeration plants)
Standardization and upgrade of status signals in the modernization of older MCC panels
It is particularly noteworthy that in SIL1 safety-related applications, although this module is not used in voting circuits, its reliable NO contact is often used as a “safety status confirmation” signal, fed back to a safety PLC (such as ABB AC500-S Safety), enhancing system diagnostic coverage.

Integration and Configuration Points
When integrating the ABB 1SVR011718R2500 into a system, note that it is only suitable for the TA25DU series and cannot be used with other brands or other ABB series (such as TA75DU). In a food factory project, I once experienced a problem where the module could not be properly secured due to incorrect use, resulting in signal loss. Always verify the relay model number.

Before installation, ensure the TA25DU relay is in the “reset” state (handle in the middle position).
Align the module vertically with the top slot of the TA25DU and press firmly until you hear a “click”.
Control wiring should use 0.5–1.5 mm² shielded cable, and be grounded nearby to suppress EMI.
If used for PLC input, it is recommended to add 10–50 ms filtering in the program to avoid false triggering due to mechanical vibration.
When replacing the module, there is no need to disconnect the power (as it does not involve the main circuit), but it is recommended to operate when the equipment is shut down.
Furthermore, the LED power is provided by the internal mechanical linkage of the TA25DU, requiring no external power supply. This is a key advantage that distinguishes it from electronic auxiliary modules – no additional power consumption and no risk of electronic component aging.

Lifecycle and Procurement Recommendations
The ABB 1SVR011718R2500 is currently in “Active” status. As a global leader in low-voltage electrical equipment, ABB continues to manufacture this module and explicitly supports its long-term availability in new projects and the spare parts market. Given the widespread application of the TA25DU series in millions of motor control circuits worldwide, this auxiliary module has stable long-term demand. We (Shenzhen Changxin), as an authorized ABB channel partner, have established a dedicated inventory and comprehensive verification process for the ABB 1SVR011718R2500. All modules are brand new and original from the factory, undergoing 100% functional testing: including contact continuity/discontinuity verification, LED status linkage testing, plug-in durability testing (≥50 times), and 48-hour aging operation. We provide a 12-month warranty, detailed test reports, and support 24-hour shipping to ensure that customers never experience signal interface interruptions during project delivery or unexpected failures.

For engineers designing or maintaining motor control centers, the ABB 1SVR011718R2500 represents a small component with an outsized impact on system transparency and serviceability. Recognizing that downtime often stems from simple signal faults, we source only genuine, factory-fresh units and validate each for mechanical fit, electrical integrity, and visual indication accuracy. Our rigorous QA ensures every module snaps securely, switches reliably, and reports status clearly—exactly as ABB engineered it. Backed by a 12-month warranty and direct access to low-voltage specialists, we deliver more than spare parts; we deliver confidence in your motor protection interface. In an era where operational visibility drives efficiency, our commitment to authenticity makes us your trusted partner for sustaining the intelligence at the edge of your control system.