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MTL F271-IS
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HIMA F3003 SILWORX 209
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MTL F860-CA
MTL F860-CA

MTL F271-IS

  • Product Name: MTL F271-IS Intrinsically Safe Foundation Fieldbus Megablock
  • Product Introduction: Passive intrinsically safe (IS) fieldbus hub for Foundation Fieldbus H1 networks, allowing connection of up to 12 field devices​ in hazardous areas (Zone 0/Class I Div 1).
Category:
Description
  • Technical Specifications:
    • Model: F271-IS
    • Connections: 12 spur connections​ (device ports) + trunk input
    • Hazardous Area Certification: Ex ia IIC Ga, II 1 G​ (Zone 0), Class I Division 1
    • Standards: IEC 60079-11, EN 50014, FISCO compliant
    • Built-in Protection: SpurGuard™​ electronic short-circuit protection per spur
    • Indicator: Green LED for power presence (>9 V DC)
    • Wire Capacity: 0.14 to 2.5 mm²
    • Operating Temperature: -40°C to +70°C​ (some refs -40°C to +80°C)
    • Dimensions: Approx. 69.1 x 50.5 x 19.9 mm
  • Functional Features: Terminates and powers Fieldbus segments safely; isolates faulty spurs without dropping segment; integrated terminator option (in -IS​ variants implies intrinsic safety barrier integration or passive IS rating for FISCO links).
  • Performance Parameters: SpurGuard trip current set per Fieldbus physical layer; insertion loss minimal; maintains signal integrity per IEC 61158-2.
  • Material Composition: Housing polyamide/UL94V-0​ or similar flame-retardant material; metal contacts tinned copper alloy.
  • Structural Characteristics: 35 mm DIN rail​ mountable; screw terminal blocks; compact Megablock footprint; transparent or labeled cover for identification.
  • Working Principle: Trunk signal passes through to all spurs; each spur has series impedance and SpurGuard​ circuit that opens on short detect (>approx 40-60 mA); power/communication maintained on healthy spurs; IS energy limitation per FISCO model.
  • Advantages: Simplifies hazardous area wiring; increases network availability; visual power indication; high density (12 devices); certified for most explosive atmospheres.
  • Applicable Industries: Oil Refineries, Chemical Plants, Petrochemical, Pharmaceutical, Mining, Grain Elevators.
  • Model Series: MTL Megablock​ Series (F241, F245, F251, F271 variants).
  • Installation Requirements: Mount on 35 mm DIN rail​ in safe/Zone 0/1/2 panel per certificate; use IS certified cable glands; ensure trunk voltage 9-32 V DC​ (typical FBPS); torque screws to 0.5-0.6 Nm.
  • Usage Precautions: Do not exceed 12 devices​ total load per segment power budget; ensure SpurGuard reset after fault clearance; verify terminator presence (switch or fixed) at segment ends; only use with FISCO​ compatible power supplies/barriers if certified as such; check Ex certificate label for entity parameters.
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