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PRODUCT POSITION:HOMEPRODUCT—SRD998-HBD0-1SA18-A1
SRD998-HBD0-1SA18-A1
The Foxboro SRD998-HBD0-1SA18-A1 is a SIL 3 certified safety relay module designed for emergency shutdown (ESD) and critical interlock systems in hazardous process environments. This configurable relay unit provides failsafe contact operation for safety instrumented systems (SIS).
DESCRIBE
Key Features
1. Safety Performance
SIL 3 (IEC 61508/61511)

Redundant relay architecture

<100ms fault detection

Forced-guided contacts (EN 50205)

2. Contact Configuration
HBD0: 4 normally open (NO) safety contacts

1SA18: 1 normally closed (NC) monitoring contact

Contact Rating:

5A @ 250V AC

6A @ 24V DC

3. Diagnostics
LED status per channel

Contact wear monitoring

Built-in test pulse generator

4. Environmental
-40°C to +70°C operating range

IP20 enclosure (higher with optional kits)

5. Certifications
TÜV Rheinland SIL 3

ATEX/IECEx (Zone 2)

UL 508

Model Number Breakdown
SRD998: Safety relay family

HBD0: 4NO contact block

1SA18: 1NC auxiliary contact

A1: Firmware revision

Typical Applications
ESD valve de-energization

Fire & gas system activation

Turbine overspeed trips
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