Product Overview

The Honeywell MLI-DR30SU Relay Output Module delivers robust, high-integrity switching for mission-critical industrial automation systems. Engineered for seamless integration with Experion PKS and other Honeywell DCS platforms, it translates control logic into reliable physical actuation of motors, valves, alarms, and safety shutdown devices. Each relay channel provides galvanic isolation to protect sensitive control electronics from electrical transients and ground loops. Proven in rotating machinery protection, emergency shutdown systems, and safety instrumented functions, the MLI-DR30SU ensures dependable operation where false switching could compromise safety, production, or asset integrity.

Output Architecture & Switching Performance

The MLI-DR30SU incorporates high-current electromechanical relays with silver alloy contacts, rated for millions of operations under full load. Independent isolation per channel prevents cross-talk and fault propagation between outputs. Integrated flyback diode protection suppresses voltage spikes from inductive loads, extending relay life. The module executes output commands with deterministic timing, ensuring synchronization with control system scan cycles. Continuous coil voltage monitoring detects contact welding or coil failure, triggering immediate diagnostics and system alerts.

Technical Specifications

Installation & Load Wiring Guidance

Mount the MLI-DR30SU in a grounded DCS rack within an EMI-shielded enclosure. Use appropriately sized wiring for each relay load, maintaining separation between power and signal conductors. Install suppression devices on inductive loads to minimize arcing and extend contact life. Verify proper grounding of all connected equipment to prevent ground potential differences. Perform functional testing of each output channel under load conditions before placing the system into service.

Extreme Environment Performance & System Integration

Deployed in offshore platforms, chemical plants, and power generation facilities, the MLI-DR30SU maintains reliable switching under vibration, temperature cycling, and corrosive atmospheres. Its ruggedized housing and sealed relay construction resist dust, moisture, and chemical ingress. Full interoperability with Honeywell TSI and safety instrumented systems enables coordinated protection and control strategies, reducing engineering complexity and lifecycle costs.

Ordering Info

(1) 1 × Honeywell MLI-DR30SU Relay Output Module (factory sealed)

(2) 1 × Installation and configuration guide

(3) 1 × Certificate of conformance and test report

(4) Anti-static protective packaging

Global Dispatch & Secure Logistics

Orders ship within 3–5 days of payment clearance via DHL, FedEx, or UPS with full tracking enabled. Each module is encased in anti-static industrial packaging with reinforced outer cartons to withstand global transit. Serialized shipping documents ensure traceability from warehouse to installation site.

Technical FAQs

Q1: Can the MLI-DR30SU drive both AC and DC loads?

A1: Yes, each relay supports AC and DC switching within the specified voltage and current ratings.

Q2: Is channel isolation sufficient for hazardous area applications?

A2: When paired with certified intrinsic safety barriers, the module meets hazardous area requirements.

Q3: What maintenance is required to ensure long relay life?

A3: Periodic contact inspection and replacement after reaching rated cycle counts prevent unexpected failures.

Q4: Does the module support forced-guided contacts for safety systems?

A4: Yes, the MLI-DR30SU uses force-guided relay contacts suitable for safety-related applications.