140DRA84000 Schneider Modicon Quantum Relay Output Module

140DRA84000 System Architecture & Overview

The 140DRA84000 provides 16 isolated Form A (1 NO) relay outputs for the Modicon Quantum controller backplane. Designed for switching mixed AC and DC voltages, each contact point includes an integrated 275 V varistor to suppress inductive kickback. The module requires only 1 output word in PLC rack memory while supporting high current switching up to 2 A resistive per point across robust electromechanical relays.

Comprehensive Technical Specifications

• Brand & Model Number: Schneider Electric 140DRA84000
• Automation Family: Modicon Quantum Automation Platform
• Output Capacity & Contact Form: 16 Discrete Relay Outputs | Form A (1 Normally Open)
• AC Voltage Operating Limits: 20 to 250 V AC (50 mA minimum load current)
• DC Voltage Operating Limits: 5 to 150 V DC (300 mA resistive at 150 V DC / 2 A at 30 V DC)
• Maximum Load Ratings: 2 A at 250 V AC / 30 V DC resistive | 1/8 hp motor rating | 10 A capacitive surge (10 ms)
• Contact Protection: Internal 275 V varistor overvoltage protection across relay contacts
• Isolation Ratings: 1780 Vrms AC channel-to-channel | 2500 V DC bus-to-channel (1 min)
• Relay Switching Speed: State 0 to 1 <= 10 ms | State 1 to 0 <= 20 ms
• Mechanical & Electrical Life: 10,000,000 mechanical operations | 200,000 electrical cycles (2 A 250 V AC)
• Backplane Power Draw & Dissipation: 1100 mA bus current | Thermal load: 5.5 W + (0.5 W x active relays)
• Standards & Certifications: UL 508, CSA C22.2 No 142, CE, FM Class 1 Division 2, ABS, GOST

Ideal Equipment & Application Scenarios

• Interfacing PLC logic directly with higher-voltage 120/230 V AC motor starters and contactor coils.
• Driving external alarm annunciators, sirens, and visual stack lights in process plants.
• Controlling solenoid valves in remote oil and gas custody transfer and pipeline valve skids.
• Isolation switching for interlocks between non-grounded DC control loops and PLC systems.

Oiltech Controls Review & Operational Insights

• Form A relay contacts allow seamless switching of mixed field power sources on a single card.
• Integrated 275 V varistors safeguard contacts against voltage spikes when switching inductive loads.
• Mind the 1100 mA backplane current draw when planning power distribution across your Modicon Quantum rack.
• Maintain a minimum load of 50 mA to prevent oxidation build-up on dry relay contacts over time.
• Verify that inductive load spikes remain within the 500 VA switching capacity limit to preserve contact life.

Diagnostics, Maintenance, and Technical Manual Access

• Green Active LED provides instant visual confirmation of active backplane communications.
• Red Fault LED signals detected internal errors or external field voltage discrepancies.
• 16 individual green LEDs report real-time energized states for each output relay contact.
• Tool-less slot insertion simplifies hot-swapping and routine maintenance during planned downtime.
• Looking for relay contact life curves, terminal block pinouts, or wiring schematics?
• Email our technical team at info@oiltechcontrols.com or message WhatsApp +86 158 8020 0923 to request the PDF documentation.

Shipping Logistics, Packaging, and 12-Month Terms

• Fast order processing with guaranteed dispatch within 24-28 hours.
• Worldwide express delivery via reliable air carriers: FedEx, UPS, and DHL.
• Secured in heavy-duty anti-static packaging to ensure damage-free transit to site.
• Covered by a full 12-month replacement warranty from Oiltech Controls.

Why Buy From Oiltech Controls?

• Over 15 years of industry experience supplying premium industrial automation spares.
• Dependable global shipment options reaching industrial sites worldwide.
• Thoroughly bench-tested surplus inventory and certified refurbished module choices.
• 12-month warranty included on all new surplus and refurbished components.
• Strict engineering verification and signal testing executed prior to every shipment.
• Dedicated sourcing channels for hard-to-find, legacy, and obsolete automation hardware.

Frequently Asked Questions & Field Engineering Guidance

Q: When should I choose the 140DRA84000 relay card over a solid-state DC output module?

A: Select the 140DRA84000 when you need dry contact isolation, need to switch AC loads (up to 250V AC), or require high-voltage DC switching where solid-state modules cannot operate.

Q: What happens if my field device draws less than the 50 mA minimum load current?

A: Loads under 50 mA may suffer from unreliable switching due to contact surface film. Adding a parallel bleeder resistor helps maintain the required minimum current draw.

Q: Why does the 140DRA84000 require 1100 mA of bus power from the rack?

A: Electromechanical relay coils draw significant current from the rack backplane bus to hold all 16 Form A contacts closed simultaneously.

Q: Are external flyback diodes needed when switching DC solenoid valves with this module?

A: While the module features internal 275 V varistor protection, installing external suppression diodes directly across heavy DC inductive coils will further extend relay contact life.

Q: How can I verify if an output contact on the 140DRA84000 has reached its electrical lifespan?

A: If the channel LED turns green but no continuity is measured across the output terminals, the internal relay contact has reached end-of-life and requires module service or replacement.

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