Model: 8922‑RB‑ISBrand: Eaton MTLSeries: MTL8000 Railbus SystemCore Function: Galvanic isolation between safe‑area Railbus and intrinsically‑safe Railbus segments, hazardous‑area bus protectionProduct Type: Railbus Backplane Isolator ModuleKey Specifications: 12 V Railbus operation, max 1.2 W power dissipation, ATEX / IECEx certified, DIN‑rail mount, segregates safe‑area and IS backplane bus segmentsObsolete Status: Obsolete / End‑of‑life
Product Overview
The Eaton MTL 8922‑RB‑IS is a dedicated Railbus isolator infrastructure unit for the MTL8000 backplane‑mount I/O system. It delivers galvanic electrical isolation to separate the safe‑area Railbus side connected to controllers or gateways from the intrinsically‑safe Railbus side powering IS I/O modules. It blocks fault‑voltage propagation from safe‑area circuits into hazardous‑area IS modules, maintaining full intrinsic‑safety certification for zone‑classified field installations. This unit is mandatory hardware for 2/1 configuration MTL8000 racks, supplied as spare‑part for legacy process‑control cabinet maintenance and retrofit projects.
Series
MTL8000 Railbus System Series. This backplane‑based intrinsic‑safety I/O platform includes IS input/output modules, power feed units, Railbus isolators and rack accessories, designed for DCS integration with hazardous‑area field instruments in oil‑gas, chemical and refinery plants.
Product Features
- Provides complete galvanic isolation between safe‑area Railbus and intrinsically‑safe Railbus bus segments
- Blocks fault‑voltage invasion to prevent damage to IS field‑side I/O modules
- Designed for mandatory deployment in all MTL8000 2/1 system rack configurations
- Operates on 12 V Railbus power, maximum power dissipation 1.2 W
- Supports configurable node addressing range 1‑32 or 1‑64 for bus segment
- ATEX, IECEx, UL certified for intrinsic‑safety hazardous‑area applications
- Compact DIN‑rail housing for standard control‑cabinet installation
- Backplane connector interface for direct Railbus system integration
- Rugged industrial enclosure for continuous 24‑hour cabinet‑mount operation
Product Parameters
| Item | Value |
|---|---|
| Part Number | 8922‑RB‑IS |
| Product Type | Railbus Intrinsically Safe Isolator |
| Bus Supply Voltage | 12 V DC Railbus |
| Safe‑Area Railbus Current | Max 50 mA |
| IS Railbus Current | Max 60 mA |
| Max Power Dissipation | 1.2 W |
| Address Range | Configurable 1‑32 / 1‑64 |
| Certifications | ATEX, IECEx, UL Intrinsic Safety |
| Mounting | DIN‑rail TS35 |
| Dimensions | 110 mm × 160 mm × 42 mm |
| Weight | 0.345 kg |
| Operating Temperature | ‑20 °C ~ +60 °C |
| Humidity | 5‑95 % non‑condensing |
Product Specifications
- Isolation function: Electrical separation of safe‑area and intrinsically‑safe backplane bus domains
- Mechanical: IP20 rated housing for cabinet‑only installation
- Compatibility: Works with full range of MTL8000 series IS I/O modules
- Lifecycle: Original manufacturing discontinued; available as surplus and refurbished spare units
- Installation note: Must be fitted within the control cabinet safe‑area; not for direct mounting inside hazardous zones
Function
- Electrically segregate safe‑area controller‑side Railbus from intrinsically‑safe field‑side Railbus segment
- Prevent over‑voltage fault propagation crossing from safe‑area circuits into hazardous‑area IS modules
- Maintain intrinsic‑safety certification integrity for MTL8000 rack‑based I/O systems
- Support bus‑segment node addressing partitioning for large MTL8000 I/O rack layouts
- Act as mandatory isolation hardware for MTL8000 2/1 system architecture
Purpose
Critical infrastructure isolator for MTL8000 Railbus I/O racks; protect intrinsically‑safe modules against safe‑area electrical faults; preserve hazardous‑area explosion‑protection compliance; serve as spare‑part for legacy process‑control cabinet repair and system retrofitting.
Application Fields
- Oil & gas on‑shore and offshore hazardous‑area process control cabinets
- Refinery and petrochemical plant MTL8000 I/O rack maintenance projects
- Chemical manufacturing intrinsic‑safety instrument system spare‑part replacement
- Power plant hazardous‑zone auxiliary control system retrofit
- Pulp & paper mill legacy MTL8000 automation cabinet renewal
- General industry ATEX / IECEx classified zone‑0 / zone‑1 process‑control installations
