Description
The ABB SPAG 333 C is a numerical generator protection relay from the ABB SPACOM family, designed for protection and monitoring of small and medium-sized power generators. It is suitable for stationary power plants as well as marine and offshore generator applications. The relay combines overvoltage, reverse-power, overcurrent, short-circuit, restricted earth-fault and residual-current earth-fault protection in a compact protection platform.
The SPAG 333 C version includes a serial communication interface for connection to higher-level data acquisition, control or host systems through the SPA communication bus. ABB documentation identifies the relay as a legacy product, making it particularly relevant for maintenance, replacement and modernization of existing SPACOM installations.
SPAG 333 C
📋 Product Datasheet
| Parameter | Specification |
|---|---|
| Brand | ABB |
| Model | SPAG 333 C |
| Series | SPACOM |
| Product Type | Numerical Generator Protection Relay |
| Main Application | Generator Protection & Network Control |
| Protection Functions | Overvoltage, Reverse Power, Overcurrent, Short-Circuit, Earth-Fault |
| Overcurrent Protection | Three-Phase Time Overcurrent & Short-Circuit |
| Earth-Fault Protection | Restricted Earth-Fault & Residual Current Earth-Fault |
| Communication | Serial Interface / SPA Bus |
| Communication Medium | Optical-Fiber SPA Bus via Bus Connection Module |
| Housing | Aluminium Case |
| Protection Rating | IP54 |
| Auxiliary Supply | 80–265 V AC/DC or 18–80 V DC, depending on power module |
| Local Interface | LED Indicators, Push Buttons & Digital Display |
| Self-Supervision | Continuous Hardware & Software Monitoring |
| Product Status | Legacy / Not Active Product |
The SPAG 333 C can use the SPGU 240A1 power module for 80–265 V AC/DC input or the SPGU 48B2 module for 18–80 V DC input. The exact supply range should therefore be verified against the installed relay’s power-module configuration.
⚙️ Key Features
🔹 Generator Protection — Designed for small and medium-sized generators used in power-generation applications.
🔹 Reverse Power Protection — Helps protect the generator prime mover against motoring conditions.
🔹 Overvoltage Protection — Provides two-stage overvoltage protection for generator voltage monitoring.
🔹 Overcurrent & Short-Circuit Protection — Integrated three-phase time-overcurrent and short-circuit protection functions.
🔹 Earth-Fault Protection — Combines restricted earth-fault protection with residual-current earth-fault protection.
🔹 SPA Communication — The C version provides serial communication for integration with higher-level data acquisition and control systems through the SPA bus.
🔹 Self-Diagnostics — Continuous supervision of relay hardware and software provides fault indication and supports maintenance troubleshooting.
🔹 IP54 Aluminium Housing — The compact relay enclosure is specified with an IP54 protection rating.
🔌 System Integration
The SPAG 333 C can be installed as the generator protection layer within an electrical power-management or generator control system. Protection measurements and relay status can be processed locally while the serial interface allows information to be exchanged with higher-level control or data-acquisition equipment.
The relay contains three main protection sections: the SPCP 3C2 overvoltage/reverse-power module, SPCJ 3C3 overcurrent module, and SPCJ 2C30 restricted/residual earth-fault module.
For replacement applications, verify the installed auxiliary power module, protection settings, CT/VT wiring, communication module and SPA-bus configuration before commissioning.
❓ FAQ
Q1: What is the ABB SPAG 333 C?
It is a numerical generator protection relay belonging to the ABB SPACOM product family.
Q2: What generators is it designed for?
It is intended for small and medium-sized generators, including applications in stationary power plants, marine installations and offshore systems.
Q3: Does SPAG 333 C support communication?
Yes. The C version includes a serial interface and can communicate with higher-level systems through the SPA bus.
Q4: What protection functions are included?
The relay provides overvoltage, reverse power, three-phase overcurrent and short-circuit protection, together with restricted earth-fault and residual-current earth-fault protection.
Q5: What is the enclosure protection rating?
The ABB documentation specifies an aluminium housing with IP54 protection.
Q6: Is SPAG 333 C still an active ABB product?
ABB classifies the SPAG 333 family as a legacy product. This makes the unit relevant for replacement, maintenance and spare-parts requirements in existing installations.
🔎 Product Keywords
ABB SPAG 333 C, ABB SPAG333C, SPACOM SPAG 333 C, ABB generator protection relay, ABB network protection relay, ABB generator relay, numerical protection relay, reverse power relay, overvoltage relay, overcurrent protection relay, earth-fault protection relay, SPA bus relay, ABB legacy relay
🔗 Product Search
📦 10 Related ABB Models
- ABB SPAG 310 C Generator Protection Relay
- ABB SPAG 320 C Generator Protection Relay
- ABB SPAG 330 C Generator Protection Relay
- ABB SPAG 331 C Generator Protection Relay
- ABB SPAG 332 C Generator Protection Relay
- ABB SPAJ 110 C Overcurrent & Earth-Fault Relay
- ABB SPAJ 111 C Overcurrent & Earth-Fault Relay
- ABB SPAJ 115 C Overcurrent & Earth-Fault Relay
- ABB SPAU 330 C Voltage Relay
- ABB SPAM 150 C Motor Protection Relay
These models belong to the broader ABB legacy SPACOM/SPA protection product family and are relevant when maintaining older generator, feeder, motor and distribution protection systems.
