Description

ABB 216GD61a HESG324436R3/A

ABB 216GD61a (Order No.: HESG324436R3/A) is an industrial‑grade integrated relay and optocoupler module, serving as a core component of the ABB REG216 digital generator protection system.Unlike the pure output modules 216NG62A and 216VC62a, its key advantage lies in its high‑density integrated design, combining optocoupler inputs, trip relays, and auxiliary relays in one unit.It is specially designed for industrial automation control systems and power system protection applications, providing an integrated solution for signal acquisition, trip control, and auxiliary switching in heavy‑industry scenarios such as power and chemical engineering.

I. Product Positioning

ABB 216GD61a (Order No.: HESG324436R3/A) is an industrial‑grade integrated optocoupler input and relay module, mainly used in the REG216 digital generator protection system and industrial automation control systems.It performs the critical functions of 16‑channel optocoupler signal acquisition, 8‑channel trip circuit control, and 16‑channel auxiliary relay switching, realizing integrated protection signal monitoring, fault trip execution, and auxiliary circuit control.

Featuring a modular, high‑density integrated design, the module is seamlessly compatible with ABB REG216 digital generator protection systems, DCS, and PLC equipment.Compared with pure output modules, it integrates optocoupler inputs and dual relay groups without requiring additional signal acquisition modules, greatly improving system integration and saving cabinet space.It provides a highly reliable, strongly isolated, and flexibly adaptable integrated interface solution for generator protection in power systems and industrial on‑site control, ensuring safe and stable system operation.

II. Technical Parameters

Item	Specification
Type	216GD61a
Order No. / Material Code	HESG324436R3/A
Module Type	Industrial‑grade integrated relay and optocoupler module (core component of REG216 system)
Optocoupler Input Channels	16 channels; Channel 1 can be used as reset input (activated by optional reset button)
Input Voltage Range	Standard: 82–312 V DC; extendable to 20–312 V DC via series resistor to match different field signal levels
Trip Relays	8 units, with surge circuits, floating trip contacts, supporting high‑speed trip control
Auxiliary Relays	16 units, for auxiliary circuit switching and signal transfer
Electrical Isolation	Full galvanic isolation between I/O channels and between channels and system; isolation voltage ≥ 2500 Vrms, effectively blocking interference
Supply Voltage	24 V DC (industrial standard); supports redundant power supply configuration, automatic switchover between primary and backup supplies to ensure continuous operation
Operating Temperature	-20℃ ～ +60℃, suitable for harsh industrial temperature environments
Storage Temperature	-40℃ ～ +85℃
Protection Class	IP20 (for mounting in control cabinets, dustproof and touch‑proof)
Dimensions (approx.)	32 cm × 26 cm × 5 cm, compact design with high space utilization
Weight (approx.)	0.3 kg, lightweight for easy installation
Terminal Type	Spring‑loaded terminals, convenient wiring and reliable contact
Communication Interface	Standard industrial bus interface, supporting data exchange with the system
Key Features	High‑density integration, wide voltage input, redundant power supply, strong galvanic isolation, surge protection, modular design, easy maintenance

III. Core Functions

1. 16‑Channel Wide‑Voltage Optocoupler Input Acquisition

The module integrates 16 optocoupler input channels with a standard input voltage range of 82–312 V DC, extendable to 20–312 V DC via series resistors to match signal levels from various sensors and actuators in industrial sites, without additional signal conditioning modules.Channel 1 is specially designed as a reset input, which can be activated by an optional reset button for module reset control.The optocoupler isolation design effectively suppresses electromagnetic interference, ensuring the authenticity and reliability of acquired signals. It can be used for real‑time acquisition of key switching signals such as generator protection and equipment status.

2. 8‑Channel Surge‑Protected Trip Relay Control

Equipped with 8 trip relays, each with a surge protection circuit and floating trip contacts, the module can directly drive trip circuits of generators, circuit breakers, and other equipment to achieve fast fault trip control.The surge protection function effectively defends against on‑site surge voltage shocks, protecting the relays and controlled equipment. It is suitable for applications requiring extremely high trip reliability, such as generator protection in power systems, with fast and stable response.

3. 16‑Channel Auxiliary Relay Switching

Integrating 16 auxiliary relays for auxiliary switching and signal transfer in industrial control loops, the module can cooperate with trip relays and optocoupler input channels to implement complex control logic, suitable for multi‑loop coordinated control scenarios.The auxiliary relays feature a modular design and reliable operation, meeting the switching requirements of various auxiliary circuits on industrial sites, reducing the need for external relays and simplifying system design.

4. Enhanced Galvanic Isolation and Anti‑Interference

Full galvanic isolation is achieved between input/output channels and between channels and the system, with an isolation voltage as high as 2500 Vrms, far exceeding the isolation level of previous pure output modules.It effectively blocks interference signals such as ground potential differences, surge voltages, and electromagnetic radiation in industrial environments, preventing signal crosstalk and module burnout, and protecting core hardware of the control system.It is suitable for power, metallurgical, and chemical sites with strong electromagnetic interference. The module adopts a multi‑layer PCB and optimized signal routing to further reduce electromagnetic interference.

5. Redundant Power Supply and High Reliability

Powered by 24 V DC (industrial standard), the module supports redundant power supply configuration. If the main power supply fails, the backup supply switches automatically to ensure continuous operation, avoiding control interruptions caused by power faults — especially important for critical applications such as generator protection.Comprehensive overcurrent and short‑circuit protection further improve operational reliability and service life.

6. High‑Density Integration and Easy Adaptation

Using a modular, high‑density integrated architecture, the module combines three core functions — optocoupler input, trip relay, and auxiliary relay — in a compact size.Compared with traditional decentralized relay layouts, space utilization is improved by more than 60%, making it ideal for space‑constrained industrial control cabinets.The modular design ensures seamless compatibility with the ABB REG216 digital generator protection system and can work with the 216DB61 trip unit, 216GE61 input auxiliary relay assembly, etc. It is also compatible with mainstream DCS and PLC equipment, enabling easy installation, commissioning, and direct integration into existing control systems.

IV. Applications

As a core component of the ABB REG216 digital generator protection system, this module is widely used in heavy‑industry sectors such as power and chemical engineering thanks to its high‑density integration, wide voltage adaptation, and strong anti‑interference performance, with a focus on generator protection and complex control loops:

1. Power Industry (Core Application)

Generator protection systems in thermal power plants, hydropower stations, and substations. As the core interface unit, it collects 16 key protection signals in real time (differential protection, overcurrent protection, loss‑of‑excitation protection, etc.) and controls 8 trip circuits (main circuit breaker, field suppression switch, excitation system, etc.), achieving fast fault tripping and signal feedback to ensure safe and stable operation of generator units.

2. Chemical Industry

DCS systems in chemical production workshops, used to collect switching signals from field equipment (motor status, valve position, alarm signals, etc.) and control actuator operation and auxiliary circuit switching. Its wide input voltage range allows direct connection to various field devices without extra signal conversion modules, reducing maintenance costs and improving system stability after commissioning.

3. Metallurgy Industry

Protection and control circuits for large equipment in ferrous and non‑ferrous metal smelting workshops. It collects equipment operating status signals, controls trip and auxiliary circuits, withstands strong electromagnetic interference and temperature fluctuations in workshops, and ensures safe equipment operation.

4. Other Industrial Scenarios

Automation control systems in large manufacturing plants and protection systems for mining equipment, used for signal acquisition, auxiliary switching, and fault trip control. Its high‑density integration simplifies system architecture and improves operation and maintenance efficiency.

V. Product Advantages

High‑density integration, space saving: Integrates 16 optocoupler inputs, 8 trip relays, and 16 auxiliary relays, replacing traditional decentralized layouts. Space utilization increased by over 60%, suitable for compact cabinets, simplifying system wiring and structure.
Wide voltage adaptation, high flexibility: Optocoupler inputs support 20–312 V DC, matching various field signal levels without extra conditioning modules, strong versatility.
Strong isolation & anti‑interference, safe & reliable: 2500 Vrms high isolation voltage, combined with multi‑layer PCB and optimized routing, effectively blocks electromagnetic interference and surges, protecting core system hardware; compliant with CE and UL standards.
Redundant power supply, continuous operation: Supports 24 V DC redundant power with automatic switchover, avoiding control interruptions from power failures, ideal for critical protection applications.
Strong compatibility, easy maintenance: Seamlessly compatible with ABB REG216 protection system and various auxiliary modules; spring‑loaded terminals for easy wiring; modular design for simple installation, replacement, and upkeep.
All‑in‑one solution: Combines signal acquisition, trip control, and auxiliary switching in one unit, eliminating extra input or relay modules, reducing system cost and failure points, improving integration and stability.