ABB SPA-ZC 21 SPA Bus Connection Module

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Manufacturer: ABB
Product No.: SPA-ZC21
Country of origin:Finland
Product Type: Bus Connection Module
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 1220g
Dimensions: 24 cm x 19 cm x 5.3 cm
Shipping port: Xiamen
Warranty: 12 months

Description

Interfacing substation secondary devices with optical communication loops, the ABB SPA-ZC 21 functions as a high-integrity electrical-to-optical bus connection module. It plays a critical role in substation automation by converting electrical signals into optical pulses and vice versa, shielding data links against extreme electromagnetic fields and electrical line interference. The SPA-ZC 21 bus connection module provides direct conversion for TTL or RS 485 signal configurations, connecting protection relays and annunciator units to a centralized fiber-optic network infrastructure. Operating natively within the ABB SPACOM product family, this unit handles data transmission across diverse power system protection and distribution networks.

Features

High-Isolation Signal Conversion: Seamlessly transforms TTL or RS 485 level signals into light pulses for optical loop transmission.
Robust Interference Immunity: Offers absolute defense against electromagnetic disturbances and high-voltage transients common in medium and high-voltage substations.
Dual-Mode Topology Compatibility: Supports dual-mode architecture, allowing field assignment in either master or slave serial communication setups.
Host-Powered Efficiency: Draws operating power directly from the connected host secondary device, eliminating the need for independent external auxiliary power units.
Integrated Connector Interfaces: Equipped with a reliable 9-pin D-type subminiature terminal connection for the host device alongside a dedicated optical transceiver pair.

Applications

Connecting standard secondary substation equipment and protection relays into fiber-optic SPA bus topologies.
Interfacing utility feeder distribution monitoring networks with centralized substation control levels.
High-noise industrial power environments requiring complete optical isolation between communication nodes.

Ordering Information

Type Designation	Transmitter Type	Receiver Type	Order Number
SPA-ZC 21BB	Plastic	Plastic	RS 951 021-AA
SPA-ZC 21BM	Plastic	Glass	RS 951 021-BA
SPA-ZC 21MB	Glass	Plastic	RS 951 021-CA
SPA-ZC 21MM	Glass	Glass	RS 951 021-DA
SPA-ZC 21BB/S	Plastic	Plastic	RS 951 021-AB
SPA-ZC 21BM/S	Plastic	Glass	RS 951 021-BB
SPA-ZC 21MB/S	Glass	Plastic	RS 951 021-CB
SPA-ZC 21MM/S	Glass	Glass	RS 951 021-DB

Technical Specifications

Parameter Category	Engineered Specification Value
Manufacturer	ABB
Part Number / Model	SPA-ZC 21
Product Series	SPA Series (SPACOM Product Family)
Part Classification	Original New Part
Power Supply Source	Powered directly from host device via D-connector (no external auxiliary source required)
Electrical Interfaces	TTL level or RS 485 level configuration options
Optical Interfaces	1 pair of optical transceivers (Rx/Tx)
Fibre Medium Options	Plastic (980/1000 micrometers) or Glass (50/125 or 62.5/125 micrometers) fiber cable
Operating Modes	Master or Slave configurable configuration
Country of Origin	Finland (FI)

Connections and Interfaces

Connector Interface	Function / Signal Mapping
9-pin D-type Subminiature Connector	Host device electrical interface supporting TTL / RS 485 signals and internal power draw
Optical Rx Port	Fibre-optic serial input receiver line for SPA bus signals
Optical Tx Port	Fibre-optic serial output transmitter line for SPA bus signals

Installation Guidelines

Ensure the host protection or annunciator device is powered down completely before securing the 9-pin D-type connector block to avoid erratic interface transitions.

Route fiber-optic cables with a generous bend radius to avoid micro-fractures in glass or plastic cores that cause attenuation loops.

Clean optical connector tips with approved visual instrument solvents before final insertion into active Rx and Tx ports to guarantee signal continuity.

Key Features:

#Bus Connection Module #Communication Modules #SPA Series

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

What is the primary function of the ABB SPA-ZC 21 module?

The SPA-ZC 21 serves as an electrical-to-optical bus connection module that converts TTL or RS 485 level signals from substation secondary devices into optical pulses for transmission over a fiber-optic SPA bus loop.

How is the SPA-ZC 21 module powered during operation?

The module does not require an external auxiliary power supply source. It draws its operational power directly from the connected host secondary device via the 9-pin D-type subminiature connector.

What configuration media options do the suffixes BB, BM, MB, and MM define?

These suffixes specify the transceiver fiber media: BB denotes plastic transmitter and plastic receiver, BM denotes plastic transmitter and glass receiver, MB denotes glass transmitter and plastic receiver, and MM denotes glass transmitter and glass receiver.

What fiber cable core sizes are supported by the glass and plastic variants?

Plastic fiber variants support standard 980/1000 micrometer plastic cables, while glass fiber variants are compatible with 50/125 micrometer or 62.5/125 micrometer multi-mode glass fiber lines.

Can the SPA-ZC 21 be deployed as a master node in a communication loop?

Yes, the module features a dual-mode topology design that allows it to be field-configured to act as either a master or a slave serial connection interface within the SPA bus architecture.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Color pattern	Greyish White
Country of origin	Finland

ABB SPA-ZC 21 SPA Bus Connection Module