MEDC SM87JB Ex Junction Box
Overview
The MEDC SM87JB is a metallic Ex junction box engineered for potentially explosive atmospheres, purpose-built to terminate and distribute field cabling for alarms, beacons, sounders and other signalling devices in hazardous plant areas. Manufactured under the Crouse-Hinds series MEDC range – the specialist alarms and signalling brand within Eaton’s hazardous area portfolio – the SM87JB gives instrumentation and electrical engineers a certified, ready-to-install enclosure that removes the guesswork from wiring MEDC sounders, beacons, call points and third-party field devices in Zone 1 and Zone 2 locations.
With fast quotation turnaround and technical support, Seven Star LLC proudly supplies the MEDC SM87JB Ex junction box to process plants, refineries, offshore platforms and marine terminals across the Sultanate of Oman and the wider GCC. Every unit shipped is backed by genuine manufacturer certification, full traceability and regional technical support, giving procurement teams in Muscat, Sohar and Salalah a dependable local source for critical hazardous-area terminations.
Operating Principle
The MEDC SM87JB functions as a passive, explosion-contained wiring hub rather than active instrument, but its protection concept is what allows it to sit safely inside a hazardous zone. The enclosure is certified to a combination of Ex d (flameproof), Ex e (increased safety) and Ex tb (dust protection by enclosure) techniques depending on configuration, meaning that any internal arc or spark generated at a terminal connection is either contained within a flameproof joint capable of withstanding internal explosion pressure, or physically prevented from occurring at all through enhanced creepage and clearance distances at the terminals.
This layered protection strategy means field cables carrying alarm, beacon or sounder circuits can be safely joined, split or extended inside the box without becoming an ignition source for surrounding flammable gases, vapours or combustible dusts. In practice this translates directly into reduced installation risk: engineers can terminate multiple circuits inside a single certified enclosure instead of running unbroken cable runs back to a safe area, cutting cable costs and simplifying maintenance access, while the sealed lid and gasket keep moisture and contamination away from live terminals in coastal and offshore environments.
Engineering Design of the MEDC SM87JB
Physically, the MEDC SM87JB is built from marine-grade stainless steel or a comparable corrosion-resistant alloy, giving it a working life in salt-laden, humid or chemically aggressive atmospheres that painted mild steel enclosures cannot match. The lid is secured with captive stainless fasteners and sealed against a compression gasket to achieve IP66 and IP67 ingress protection, so the enclosure remains dust-tight and capable of withstanding temporary submersion – a critical requirement on offshore platforms, FPSOs and coastal desalination sites where washdown and spray exposure are routine.
Internally, the box provides a generous terminal chamber sized to accept multiple incoming and outgoing cable glands, with a standard range of cable entry options to match armoured or unarmoured cable in various diameters. Certified to EN60079-0, EN60079-1 and EN60079-31 with temperature classifications up to T4/T5/T6, the SM87JB is rated for Zone 1 and Zone 2 gas atmospheres as well as Zone 21/22 dust atmospheres, and is available with a range of gland entry patterns and terminal configurations to suit new-build junction requirements or retrofit rewiring of existing MEDC alarm loops.
Key Features
The MEDC SM87JB combines certified hazardous-area protection with a rugged mechanical build, giving engineers a single enclosure that covers gas, dust and marine duty in one certified product line:
- Certified to Ex II 2GD, Ex d IIC T4/T5/T6 Gb and Ex tb IIIC T135/T100/T85°C Db for combined gas and dust hazardous area protection.
- IP66 and IP67 ingress protection rating ensures reliable sealing against dust, washdown spray and temporary immersion.
- Marine-grade stainless steel or corrosion-resistant alloy construction extends service life in offshore and coastal installations.
- Suitable for both Zone 1 and Zone 2 hazardous area classifications without requiring a different enclosure family.
- Generous internal terminal chamber accommodates multiple cable entries for looping alarm and signalling circuits.
- Compatible with the full MEDC range of sounders, beacons, combination units and manual call points as a dedicated termination point.
- IECEx and ATEX certification documentation is available for every unit, simplifying plant hazardous-area registers and audits.
- Robust captive-fastener lid design speeds up maintenance access while preserving the certified seal integrity on reclosure.
Industrial Applications
The MEDC SM87JB Ex junction box is specified wherever alarm, signalling or beacon circuits need a certified termination point inside a classified hazardous area. Typical deployments include offshore oil and gas platforms, onshore gathering stations, LNG and LPG terminals, tank farms, and petrochemical process units where sounders, strobes and manual call points form part of the fire and gas detection and evacuation alarm system. Marine applications on FPSOs, drilling rigs and tanker terminals also rely on the SM87JB’s corrosion-resistant construction to survive prolonged salt-spray exposure without loss of certification integrity.
With engineering support in Muscat, Seven Star LLC supplies the MEDC SM87JB on request to EPC contractors, refinery maintenance teams and offshore operators throughout Oman and the GCC, including projects in the Sohar and Salalah free zones and the upstream fields of the interior. Manufacturer documentation and technical support with selection mean plant engineers can specify the SM87JB with confidence, with availability and lead time confirmed at quotation.
Technical Specifications
The table below summarizes the key technical parameters of the MEDC SM87JB Ex junction box as supplied by Seven Star LLC.
| Parameter | Specification |
|---|---|
| Model | MEDC SM87JB |
| Type | Ex junction box – alarms and signalling |
| Protection Concept | Ex d / Ex e / Ex tb |
| Certification | EN60079-0, EN60079-1, EN60079-31; Ex II 2GD |
| Temperature Class | Ex d IIC T4/T5/T6 Gb; Ex tb IIIC T135/T100/T85°C Db |
| Ingress Protection | IP66 and IP67 to EN60529 |
| Zone Rating | Zone 1 and Zone 2 (gas); Zone 21/22 (dust) |
| Material | Marine-grade stainless steel / corrosion-resistant alloy |
| Cable Entries | Multiple gland entries, various sizes on request |
| Application | Onshore, offshore and marine oil, gas and petrochemical facilities |
| Brand | MEDC – Crouse-Hinds series (Eaton) |
Request a Quote for MEDC SM87JB Ex Junction Box
Seven Star LLC stocks and supplies the MEDC SM87JB Ex junction box for immediate quotation across Oman and the GCC. Backed by genuine manufacturer documentation, we can issue a formal RFQ, confirm regional warehouse availability, and provide the full technical datasheet and certification package on request. Contact our instrumentation and hazardous-area equipment division today to discuss project quantities, lead times and site-specific gland configurations for your Muscat, Sohar or Salalah facility.
Other Models in the MEDC SM87 Hazardous Area Beacons Range
Seven Star LLC supplies models from the MEDC SM87 Hazardous Area Beacons range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| MEDC SM87 Hazardous Area Beacon, ATEX Zone 1 & 2 Ex d | Fire & Gas Systems | View details |
| MEDC SM87LED Ex LED Beacon Range | Fire & Gas Systems | View details |
| MEDC (Eaton) SM87BGLAD1T1B1NNRAS Explosion-Proof Beacon 24VDC | Fire & Gas Systems | View details |
| MEDC SM87JB Ex Junction Box | Automation Accessories | You are viewing this model |
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- Datasheet MEDC SM87JB Ex Junction Box Datasheet Download
MEDC product families on this page
Visual signals include the XB15 xenon beacon, the LD15 LED beacon and the SM87 beacon family with its SM87LED version, for Zone 1 and Zone 2 areas. The DB3 is the alarm sounder. Manual alarm devices are the BG manual call point and a manual release unit from the BG2 call point series, listed as BG2E. The SM87JB junction box completes the field wiring. These devices are ordered with long codes such as SM87BGLAD1T1B1NNRAS or BGEB4B6B1DDCF7R, in which each block of characters selects an option.Where MEDC signaling equipment is used
MEDC beacons and sounders announce fire, gas and process alarms on production platforms, in gas plants, refineries, chemical plants, loading terminals and marine vessels. Call points give personnel a way to raise the alarm by hand, and the same devices are wired into fire and gas panels from many system builders.Ordering MEDC beacons and call points: what we need
The complete order code from the label or the project datasheet is the best starting point. If you are selecting from scratch, send the supply voltage, lens color for beacons, tone and sound level for sounders, enclosure material and finish color, cable entry size and number, the certification required and the ambient temperature. For call points add the switch arrangement, any series or end-of-line resistor values, and label or duty plate text.Browse MEDC products by category: Fire & Gas Systems, Fire & Gas Detector, Automation Accessories.
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