Description

MTL 8621‑FT‑IS Intrinsically‑Safe Field Terminal Base

Technical Specifications

• Product Model: 8621‑FT‑IS
• Brand: MTL
• Warranty: One Year
• Input Voltage: Passive terminal assembly; max 250 VAC terminal rating, no internal power consumption
• Operating Temperature: ‑40 °C to +70 °C
• Storage Temperature: ‑45 °C to +85 °C
• Response Time: Not applicable (passive wiring termination hardware)
• Protection Class: IP20, DIN‑rail carrier‑mount; ATEX / IECEx Zone 2 IIC T4 cabinet‑side; field‑wiring certified for Zone 0/1 [EEx ia] IIC hazardous‑area instruments
• Accuracy Class: Passive signal routing, no signal conversion
• Output Frequency: Not applicable
• Rated Current Range: 3 A per‑channel continuous; screw‑clamp terminals accept 0.5‑2.5 mm² instrument cables
• Communication Interface: PAC8000 module mating connector; screw‑clamp field terminals; integrated tag strip for loop labelling
• Supported Protocols: Passive interface for PAC8000 IS‑series I/O modules (8201‑HI‑IS, 8215‑DO‑IS, 8202‑HO‑IS)
• Overload Capacity: Mechanical anti‑mismatch key‑coding; intrinsic‑safety entity‑parameter compliance; no built‑in electronic protection
• Dimensions: 42 mm (W) × 88 mm (D) × 39.5 mm (H), PAC8000 standard I/O footprint

Product Overview

The 8621‑FT‑IS is blue‑coloured snap‑on intrinsically‑safe field‑terminal base for PAC8000 hazardous‑area remote‑I/O systems. It provides field‑wiring screw terminals for IS‑rated analog‑input, analog‑output and digital‑output modules, and mechanically mates with PAC8000 DIN‑rail carrier. It transfers energy‑limited intrinsically‑safe signals between safe‑area I/O electronics and Zone 0/Zone 1 field transmitters, valve positioners and solenoid loads.

This terminal base addresses hazardous‑site automation challenges: certified intrinsic‑safety signal termination for explosive‑risk field loops, mechanical interlock to prevent mixing IS‑modules with non‑IS terminal hardware, and drop‑in spare‑part compatibility for PAC8000 remote nodes. It supports hot‑swap module replacement online without disconnecting field cables. Oil‑gas pipeline‑station automation engineers, well‑site technicians and hazardous‑area retrofit integrators benefit most. It fits standard PAC8000 DIN‑rail carriers, terminal base can be replaced independently without changing I/O electronics, reducing maintenance downtime for natural‑gas compressor‑stations, refineries and petrochemical remote‑site installations.

Key Application Notes

• Passive terminal base; must pair with PAC8000 IS‑series I/O modules; cannot run standaloneEmerson
• Blue IS‑rated terminal base; never use non‑IS terminals such as 8610‑FT‑NA / 8612‑FT‑NA with IS‑modules
• Mechanical key‑coding prevents mismatched non‑IS‑module insertion, maintaining intrinsic‑safety certification
• Field‑side wiring permits Zone 0 / Zone 1 intrinsically‑safe field instruments; terminal base itself installs in safe‑area or Zone 2 cabinet only
• Supports hot‑swap I/O module exchange while system remains powered online; field wiring stays connected to terminal base
• Equipped with labelling strip for channel‑point identification; screw‑clamp terminals accept multi‑strand instrument wiring
• Conformal‑coated PAC8000 carrier variants available for cabinets with high‑humidity and airborne‑contaminant exposure