The Honeywell TK-PRR021 51309288-475 is a three-channel relay-output safety-isolator module that sits between the DCS and hazardous-area field devices. Certified to IECEx/ATEX and engineered for Experion® PKS & TPS, it delivers galvanic isolation, intrinsic safety and online diagnostics in a DIN-rail, hot-swappable package—perfect for ESD, fire-&-gas and sequential control applications where a single spark is one too many.
Key Specifications
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Parameter
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Value
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Part Number
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TK-PRR021 51309288-475
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Function
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3-ch relay output safety isolator
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Supply
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24 VDC (20…30 VDC)
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Consumption
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≈ 5 W
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Output
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3 × SPDT, 2 A 250 VAC / 30 VDC (resistive)
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Isolation
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3.7 kV AC input-to-output, ch-to-ch
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Certifications
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IECEx, ATEX, UL, CSA – Zone 1 / Cl I Div 2
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Temp Range
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20 °C…+60 °C (op) / 40 °C…+80 °C (store)
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Mounting
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DIN-rail, 22.5 mm wide
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Weight
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≈ 0.4 kg
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Diagnostics
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Coil-open, contact-sticky feedback
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Competitive Edge vs. Conventional Safety Barriers
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Feature
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TK-PRR021
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Typical zener barrier + relay
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Channels per unit
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3 isolated SPDT
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1 non-isolated
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Built-in relays
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Yes – plug-in
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External required
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Diagnostic reporting
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Back-plane & LED
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None
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Hot-swap
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Supported
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No
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Certifications
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IECEx/ATEX/UL
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ATEX only (often)
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Typical Wiring Snapshot
DCS DO → TK-PRR021 input → 3.7 kV isolation → SPDT relay → hazardous-area solenoid / alarm / motor starter.
One module replaces three external relays + three barriers, shaving 30 % panel space and 25 % wiring hours.
Shipping & Support
✔ In-stock today – ships within 24 h
✔ 12-month replacement warranty
✔ Factory-sealed or certified-refurb units
✔ Free remote loop-check assistance
Contact May – Sales Manager
E-mail: ab@mooreplc.com
Phone / WhatsApp: +86-18106909650
WeChat ID: dcsfcs
Need a quote or SIL-loop calculation? Message May and receive a formal quotation in under 30 minutes.
What happens next?
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Your quote
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