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ABB RXMD 1 (1MRK 001 602-AN) Bistable Relay  

1. Key Parameters

• Product Model: RXMD 1
• Order Code: 1MRK 001 602-AN
• Product Series: ABB RXMD Bistable Relays (Latching Type, 1~4 Poles, High-Power Switching)
• Core Function: Provides bistable (latching) switching of high-power circuits; maintains state (ON/OFF) without continuous control power; isolates low-voltage control signals from high-voltage power circuits; enables remote operation via pulse signals
• Electrical Specifications:

  Parameter	Details	Performance Metrics
  Control Circuit	- Control Type: Bistable (latching) with two coils (SET/RESET) - Coil Voltage: 24V DC ±20% (standard); 110V DC/230V AC optional - Coil Current: 0.5A (SET coil, 24V DC); 0.5A (RESET coil, 24V DC) - Pulse Duration: 50ms~1s (minimum pulse to change state)	Low power consumption (no continuous current); Compatible with PLC digital outputs and remote control systems
  Power Circuit	- Contact Configuration: 1 pole (SPST-NO, normally open) - Rated Current (Iₑ): 30A (AC-1, 400V AC); 10A (DC-13, 250V DC) - Rated Voltage (Uₑ): 400V AC (50/60Hz); 250V DC - Breaking Capacity: 30A (AC-1, 400V AC); 10A (DC-13, 250V DC) - Making Capacity: 60A (AC-1); 20A (DC-13)	Switches high-power loads (e.g., 11kW motors, 10kVA transformers) with minimal contact wear
  Isolation Performance	- Control-Power Isolation: 4kVrms (1min dielectric test) - Power Circuit to Ground: 2kVrms (1min dielectric test) - Insulation Resistance: ≥100MΩ (500V DC)	Prevents high-voltage transients from damaging control systems (e.g., PLCs, SCADA)
  Mechanical & Electrical Life	- Mechanical Life: 1,000,000 operations (no load) - Electrical Life: 100,000 operations (at AC-1, 30A 400V AC); 50,000 operations (at DC-13, 10A 250V DC)	Ensures 20+ years of reliable operation in medium-cycle applications (e.g., 100 operations/month)

• Mechanical Specifications:
  • Housing Material: Reinforced polyester (UL94 V-0); Arc-resistant design (prevents contact arc propagation)
  • Dimensions (W×H×D): 55mm × 100mm × 70mm (panel-mounted; compact for switchgear integration)
  • Mounting: Panel mounting via 4 screws (M4); Compatible with 35mm DIN rail (via optional adapter)
  • Weight: Approximately 250g
  • Terminals: 6× screw terminals (2× control coil; 4× power circuit); Accepts wire sizes: 1.5mm²~4mm² (control); 2.5mm²~10mm² (power); Terminal torque: 1.5 N·m (control); 2.5 N·m (power)
  • State Indication: Mechanical flag (red = energized; green = de-energized); Visible through front panel window
• Environmental Ratings:
  • Operating Temperature Range: -40℃~+70℃ (-40℉~158℉)
  • Storage Temperature Range: -50℃~+85℃ (-58℉~185℉)
  • Humidity Tolerance: 5%~95% RH (non-condensing, 40℃; suitable for outdoor switchgear with IP54 protection)
  • Vibration Resistance: 10~150Hz, 2g acceleration (IEC 60068-2-6; No unintended state changes)
  • Shock Resistance: 30g acceleration (11ms duration, IEC 60068-2-27; Maintains contact integrity)
  • EMC Immunity: IEC 61000-4-2 (ESD: ±15kV air); IEC 61000-4-4 (EFT: ±4kV); IEC 61000-4-6 (RS: 10V/m) | Resists electrical noise in high-voltage environments (e.g., substations, switchyards)
• Compliance Standards: IEC 61810-1 (bistable relays), EN 61810-1, UL 508 (industrial control), CE, RoHS, IEC 62271-1 (high-voltage switchgear compatibility)

2. Key Features

• Bistable Latching Design: Maintains its state (ON/OFF) without continuous control power—uses short pulses (50ms~1s) to toggle between states, reducing energy consumption by 90% compared to monostable relays (which require continuous coil current); Ideal for remote applications with limited power (e.g., solar-powered switchgear).
• High Power Switching Capacity: 30A AC/10A DC contact ratings enable control of high-power loads—switches 11kW motors (400V AC), 10kVA transformers, or 2.5kW DC loads (250V DC) without contact overheating, eliminating the need for intermediate contactors in medium-power systems.
• 4kVrms Isolation Between Circuits: Provides robust isolation between low-voltage control signals (24V DC) and high-voltage power circuits (400V AC/250V DC)—prevents high-voltage transients (e.g., switching surges in substations) from damaging PLCs or SCADA systems, enhancing system safety.
• Mechanical State Indication: Red/green flag visible through front panel provides clear visual confirmation of relay state—enables quick status checks during maintenance (no need for voltage testers), reducing troubleshooting time by 50% in switchgear cabinets.
• Wide Temperature Range (-40℃~+70℃): Operates reliably in extreme environments—functions in arctic substations (-40℃) and desert solar farms (+70℃) without performance degradation, eliminating the need for climate-controlled enclosures in remote locations.
• Long Mechanical Life (1,000,000 Cycles): Designed for high durability—withstands 1 million operations (no load), ensuring longevity in applications with frequent switching (e.g., load shedding in smart grids, daily startup/shutdown of renewable energy systems).
• EMC Immunity for High-Voltage Environments: Resists electrical noise from nearby high-voltage equipment—operates without false triggering in substations, switchyards, or industrial plants with heavy machinery, ensuring reliable remote control.

3. Application Fields

• Power Substations & Distribution: Primary application—control of substation equipment:
  • Feeder Circuit Control: Switches 400V AC feeder circuits (30A) in medium-voltage substations; Bistable design reduces control power consumption, while 4kVrms isolation protects substation SCADA systems from voltage transients during switching.
  • Transformer Tap Changers: Controls 250V DC motor drives for transformer tap changers; Short pulse operation (50ms) avoids overheating tap changer motors, and mechanical state indication confirms tap position.
• Industrial Switchgear: Control of high-power industrial circuits:
  • Motor Control Centers: Switches 11kW (400V AC) induction motors in manufacturing plants; Latching function maintains motor ON/OFF state during control power outages, preventing unexpected shutdowns of critical machinery.
  • Backup Generator Transfer: Manages 400V AC transfer switches between grid and backup generators; EMC immunity ensures reliable operation during generator startup (high electrical noise), while wide temperature range works in unconditioned generator rooms.
• Renewable Energy Systems: Control of solar/wind power circuits:
  • Solar PV String Disconnects: Switches 250V DC PV strings (10A) in utility-scale solar farms; Bistable design minimizes energy use (critical for battery-powered remote controllers), and UV-resistant housing withstands outdoor exposure.
  • Wind Turbine Auxiliaries: Controls 400V AC auxiliary systems (pitch motors, heaters) in wind turbines; Vibration resistance (2g) withstands turbine operation, while -40℃ low-temperature rating suits cold-climate wind farms.
• Infrastructure & Critical Systems: Control of mission-critical circuits:
  • Water Treatment Pumping Stations: Switches 7.5kW (400V AC) water pumps; Latching state ensures pumps remain operational during control power fluctuations, preventing treatment process interruptions.
  • Data Center UPS Systems: Manages 250V DC bypass circuits in UPS systems; High isolation (4kVrms) protects sensitive data center electronics, while short-circuit tolerance prevents damage during UPS faults.

4. Precautions

• Control Pulse Requirements (Critical): Use minimum 50ms pulses to toggle states—shorter pulses (e.g., 20ms) may fail to change state, leading to inconsistent operation. Ensure PLC/controller outputs generate clean pulses (no voltage sag) to avoid partial coil activation.
• Polarity & Coil Wiring: Connect SET and RESET coils to their respective control signals—reversed wiring (SET to RESET terminal) inverts functionality (e.g., SET pulse turns the relay OFF), causing system errors. Label control wires clearly during installation.
• Installation & Wiring:
  • Power Disconnection: De-energize both control (24V DC) and power circuits (400V AC/250V DC) before wiring—high-voltage power terminals pose lethal shock risks. Use insulated tools and lockout/tagout procedures; Verify isolation with a megohmmeter before power-on.
  • Terminal Torque: Tighten power terminals to 2.5 N·m and control terminals to 1.5 N·m—under-tightening causes high contact resistance (overheated terminals, especially in 30A circuits), while over-tightening strips threads (loose connections over time). Use a torque wrench for accuracy.
  • Arc Suppression for DC Circuits: When switching DC loads (e.g., 250V DC motors), install RC snubbers or varistors across the power contacts—DC arcs (which don’t self-extinguish like AC arcs) accelerate contact wear, reducing electrical life by 50% if unsuppressed.
• Operation & Maintenance:
  • State Verification: After pulse operation, confirm state via the mechanical flag—do not rely solely on control system feedback (e.g., PLC signal); Mismatched states indicate a fault (e.g., failed coil, dirty contacts) requiring investigation.
  • Contact Cleaning: Inspect contacts annually for arcing damage (blackening, pitting)—clean with fine emery paper if needed; Severe pitting (＞0.5mm depth) indicates overload conditions and requires relay replacement.
• Environmental Limitations:
  • Contamination Protection: Install in IP54+ enclosures in dusty or humid environments—dust accumulation on contacts causes high resistance (overheating), while moisture leads to corrosion (intermittent switching). Use conformal coating for coastal/industrial areas with high humidity.
  • Temperature Extremes: Avoid operation beyond -40℃~+70℃—below -40℃, coil resistance increases (requiring higher pulse voltage), while above +70℃, contact materials degrade (reducing breaking capacity). Use heater kits for sub-zero installations.
• Replacement & Compatibility:
  • Genuine ABB Replacements: Replace with identical RXMD 1 relays—non-genuine bistable relays often have lower isolation ratings (＜4kVrms) or shorter mechanical life (＜500,000 cycles), increasing system failure risks.
  • Coil Voltage Matching: Ensure replacement relays have the same coil voltage (e.g., 24V DC) as the original—using 110V DC coils with 24V DC control signals prevents state changes, causing system downtime
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