KJ3242X1-FA1 | Emerson DeltaV | Redundant H1 Terminal Block

Overview

The Emerson KJ3242X1-FA1 is a Redundant Fieldbus H1 Terminal Block for DeltaV™ distributed control systems. It provides redundant wiring termination for FOUNDATION Fieldbus H1 networks, ensuring continuous operation even if one fieldbus segment fails.

Technical Specifications

• Manufacturer: Emerson
• Model: KJ3242X1-FA1
• Also Known As: 12P2575X032
• Type: Redundant H1 Terminal Block
• Input Power Rating: 35 VDC @ 500 mA
• Weight: ~0.3 – 0.9 kg (varies by source)
• Dimensions: ~13 × 10 × 5 cm

Environmental & Safety Ratings

• Operating Temperature: −40 °C to +70 °C
• Shock: 10 g, ½ sine wave for 11 ms
• Vibration: 1 mm p-p (2–13.2 Hz); 0.7 g (13.2–150 Hz)
• Relative Humidity: 5 % – 95 % non-condensing
• Airborne Contaminants: ISA-S71.04-1985 Class G3
• Hazardous Area: ATEX II 3G Ex ec IIC Gc; FM; IECEx; UKEX; Class I Div. 2

Key Features

• Redundant architecture provides backup connectivity for H1 fieldbus segments
• Hazardous-area certified for global explosive-atmosphere installations
• Rugged construction withstands shock, vibration, and corrosive contaminants
• Rotary keying ensures correct pairing with the H1 interface card

FAQ

Q: What does “redundant” mean for this terminal block?
A: It supports dual H1 segment wiring so that if the primary segment is interrupted, the backup segment maintains communication with field devices.

Q: Is this compatible with Series 2 H1 cards?
A: Yes, when matched to the appropriate H1 card via the keying system.

Q: Can I hot-swap this block?
A: Field power must be de-energized before removal or insertion.

Installation Guidelines

1. Set the rotary key position to match the H1 I/O card.
2. Terminate redundant H1 segment A and segment B wiring per the system drawing.
3. Verify shield grounding at one end only to prevent ground loops.
4. Confirm hazardous-area gland and conduit seals are intact.

Selection Tips

• Choose KJ3242X1-FA1 for mission-critical fieldbus loops requiring redundancy.
• Pair with KJ3242X1-BA1 (H1 Series 2 Card) or equivalent for full functionality.
• Verify your H1 card key position before ordering the terminal block.