ABB SPA-ZC22｜Bus Connection Module｜

SPA-ZC22

SPA-ZC22

The ABB SPA-ZC22 is a Bus Connection Module used to interface protection relays, controllers, and annunciator units (such as the SPACOM family) with the fiber-optic SPA bus system in substation automation networks.

Technical Specifications

Specification Details
Manufacturer ABB
Model / Type SPA-ZC22 / SPA-ZC 22
Module Function Electrical-to-Optical Signal Converter / Optical Bus Interface
Input Interfacing RS-232 (25-pin D-sub), RS-485 / SPA (+5V TTL) via 9-pin D-sub
Fiber Connections 2 or 5 optical transceiver pairs (Plastic or Glass optical fibers)
Operating Modes Master mode, Slave mode, or Optical Repeater mode
Auxiliary Power Options High-voltage (110/125/220 VDC; 110/120/230/240 VAC) or Low-voltage (24/48/60 VDC)

Key Functions & Characteristics

Signal Conversion & Loop Isolation: Converts serial electrical signals (RS-232, RS-485, TTL) into fiber-optic signals and vice versa, isolating substation control equipment from electromagnetic interference (EMI).

Independent Power Unit: Equipped with an internal power supply unit so connected relays/SPACOM devices can be disconnected or serviced without breaking the fiber-optic loop continuum.

Configurable Communication: Features DIP-switch selection to set operating modes (Master, Slave, or Optical Repeater) and signal paths.

Optical Repeater Mode: Allows incoming fiber-optic signals on one transceiver pair to be retransmitted and split across other connected fiber-optic loops.