Foxboro BS811TH Power Supply Module

Overview

The Foxboro BS811TH is a high-performance power supply module engineered for the Foxboro I/A Series Distributed Control System (DCS). It delivers stable, regulated 24 VDC power to Fieldbus Modules (FBMs), controllers, communication interfaces, and other critical DCS components. Designed for continuous operation, it features redundancy support, advanced protection mechanisms, and robust tolerance to industrial conditions.

Design and Functionality

The BS811TH provides reliable, uninterrupted power from a 120/240 VAC input with a high-capacity 10 A output. Its modular design supports dual-redundant operation and ensures secure integration within racks or cabinets. Industrial-grade protections against over-voltage, over-current, and thermal events make it ideal for mission-critical automation environments such as oil & gas, chemical processing, power generation, and water treatment.

Technical Specifications

Alternate Catalog Variant

Some suppliers list the BS811TH as a high-input analog module supporting signals such as:

• Current: –40 to +40 mA

• Voltage: 0 to 10 V, 4–20 mA

• RTDs and Thermocouples

• Accuracy: ±0.1% FS

• Response Time: <2 s

• Operating Temperature: –40°C to +80°C

This variant reflects alternate cataloging, but the primary and authoritative description identifies BS811TH as a power supply module.

Key Features

• Provides stable 24 VDC regulated output to DCS components

• Supports high-capacity 10 A output with dual-redundant operation

• Advanced protection against over-voltage, over-current, and thermal overload

• Compact, rack- or cabinet-mountable design

• Reliable performance in harsh industrial environments

Typical Applications

• Oil & gas production and refining

• Chemical and petrochemical plants

• Power generation and utility control systems

• Pulp & paper processing

• Water and wastewater treatment facilities

FAQ

Q: Can BS811TH be used in redundant configurations?
A: Yes, it supports dual-redundant operation for high availability.

Q: What is the maximum output current?
A: The module provides up to 10 A output at regulated 24 VDC.

Q: Is it suitable for high-temperature industrial environments?
A: Yes, the operating range is 0°C to 60°C, with storage tolerance from –40°C to +85°C.