Description
Component Snapshot At-a-Glance
- Model: IS220TRPGH1B
- Alt. P/N: IS200TRPGH1B (Mark VI legacy variant)
- Product Series: GE Speedtronic Mark VIe / VIeS
- Hardware Type: Primary Trip I/O Terminal Board (TRPG)
- Key Feature: 48-point screw terminal block with 2500V galvanic isolation
- Primary Field Use: Direct field wiring interface for TRPA/PTUR primary trip I/O packs
IS220PDOAH1A
Hard-Numbers: Technical Specifications
- Terminal Count: 48× screw terminals (1–24, 25–48)
- Channel Isolation: 2500 VAC RMS field-to-backplane
- Voltage Rating: 30 VDC max field signal
- Current Rating: 2 A per terminal
- Wire Gauge: 24–16 AWG (0.5–1.5 mm²)
- Torque Spec: 0.5–0.6 N·m (4.4–5.3 lb·in)
- Operating Temp: -30°C to +70°C
- Connector: 1× DC-37 male backplane connector
- Hazardous Rating: Class I Div 2, Zone 2, ATEX/IECEx
- Dimensions: 158.75 × 107.95 × 25 mm
- Weight: 0.55 kg
- Mounting: DIN rail or direct panel mount
- Compliance: IEC 61508 SIL 2, API 670
The Real-World Problem It Solves
Standard terminal blocks lack channel-to-channel isolation for safety trip signals. Noise and ground loops corrupt critical trip inputs, causing false trips or failed shutdowns. provides fully isolated signal paths for each trip channel, preserving signal integrity in high-electrical-noise industrial environments.
Where you’ll typically find it:
- Wired between field safety sensors and IS220TRPAH2A primary trip packs
- Gas turbine emergency shutdown (ESD) system field terminations
- Steam turbine overspeed and thrust fault trip signal wiring
Bottom line: eliminates signal cross-talk and ground loops to ensure reliable safety trip signal transmission.
Hardware Architecture & Under-the-Hood Logic
is a passive termination board with dedicated isolation circuitry per channel. It contains no active components or microprocessors.
- Field trip signals wire directly to 48 screw terminals.
- Each input routes through on-board galvanic isolation barriers.
- Isolated signals pass to DC-37 backplane connector.
- Backplane connects to mating TRPA/PTUR trip I/O pack.
- On-board status LEDs indicate power and channel activity.
- Isolation barriers block ground loops and electrical noise.
- Terminal assignments match TRPA I/O channel mapping.
IS220PDOAH1A
Field Service Pitfalls: What Rookies Get Wrong
Over-Torqued Terminal ScrewsCranking terminals past spec strips screw threads and deforms contact plates. Causes intermittent open circuits and hard-to-diagnose trip faults.
- Field Rule: Use torque screwdriver set to 0.55 N·m; never use impact drivers on terminals.
Daisy-Chained GroundsConnecting multiple channel grounds in a daisy-chain creates high-impedance paths. Induces common-mode noise and false trip triggers.
- Quick Fix: Run individual ground wires from each channel to cabinet bus bar; avoid daisy-chaining.
Unlabeled Field WiresPoor labeling leads to miswired channels during maintenance. Results in reversed trip logic or non-functional safety circuits.
- Field Rule: Label every wire with signal name and channel number; verify continuity before power-up.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
