High Power Latching Relay NT95L-A-D-Z Series – 50A PCB Type Latching Relay
Product Overview
The NT95L-A-D-Z series is a high-performance Latching Relay (also known as a bistable relay) designed for demanding power switching applications up to 50A. Available in both DC12V and DC24V coil versions, this relay features a dual-coil magnetic latching mechanism that maintains its contact state without continuous coil power, significantly reducing energy consumption. With a compact PCB-mount design, low coil power dissipation (0.3~0.43W), and fast switching time (≤4ms), the NT95L-A-D-Z is the ideal choice for smart meters, EV charging stations, industrial power controls, and renewable energy systems. As a core product in YM's portfolio, this relay shares the same robust engineering found in our Metal Sealing Relay, Polarized Relay, PCB Board Relay, Automotive Relay, and Industrial Power Relay families, ensuring consistent quality and reliability.
Technical Specifications
Coil Parameters
- Coil power consumption: (0.3~0.43)W
- Available coil voltages: DC12V, DC24V
- Incentive pulse width: (10～50) ms
- Action / release time: ≤4ms (both) – high-speed response
Contact Ratings & Life
- High power contact rating: 50A at 250VAC / 30VDC (resistive load) – electrical life ≥ 1×10⁵ operations
- Low level contact rating: (10~50)μA, (10~50)mV – 1×10⁵ operations, suitable for sensitive signal switching
- Initial contact resistance: ≤50mΩ; after life test ≤200mΩ
Dielectric & Insulation
- Dielectric strength (normal atmosphere): 500Vr.m.s., 50Hz; under low pressure: 250Vr.m.s., 50Hz
- Insulation resistance (normal atmosphere): >500MΩ; after high level life test: >50MΩ
Mechanical & Environmental
- Weight: <3g – ultra-light for PCB mounting
- Sealing (leakage rate): ≤10⁻³ Pa·cm³/s (hermetic construction)
- Operating temperature: -40°C to +85°C
All parameters are verified under 25°C ambient temperature (coil specifications referenced at 25°C). The NT95L-A-D-Z series is designed to meet strict industrial and automotive-grade requirements, making it a drop-in solution for high-reliability applications.
Product Images & Visuals
Above: NT95L-A-D-Z series relay – compact design for 50A switching. Contact your YM representative for high-resolution dimensional drawings and 3D models.
Key Features & Advantages
- True Latching (Bistable) Operation: Dual-coil design holds contact state without continuous coil current – saves energy and reduces heat generation, ideal for battery-powered or green energy systems.
- 50A High Power Switching: Handles heavy loads up to 50A resistive, suitable for EV chargers, inverters, and industrial power distribution.
- Ultra-Low Coil Consumption: Only 0.3~0.43W pulse power – compatible with microcontroller direct drive and reduces power supply costs.
- Fast Response & Sealed Construction: ≤4ms operate/release time ensures precise timing control; hermetic sealing (≤10⁻³ Pa·cm³/s) protects against dust, humidity, and corrosive atmospheres, extending service life in harsh environments.
- High Insulation & Dielectric Strength: >500MΩ insulation resistance and 500Vrms dielectric withstand voltage guarantee safe isolation between coil and contacts.
- Proven Low-Level Switching Capability: Reliably switches signals as low as 10μA/10mV – perfect for mixed signal applications (power + sensing).
Compared to standard non-latching relays, the NT95L-A-D-Z eliminates holding power waste, significantly reducing long-term operating costs in applications like smart meters or remote monitoring stations. YM’s advanced manufacturing process ensures consistent contact resistance and mechanical durability, backed by 100% final testing.
Related YM technologies: Our expertise in Polarized Relay and Military Metal Relay design directly contributes to the superior magnetic circuit efficiency of the NT95L series. For PCB-mounted applications, this relay complements our PCB Board Relay and Flash Relay product lines, offering a complete power switching solution.
How to Use the NT95L-A-D-Z Latching Relay – Step by Step
- Determine coil polarity & pulse width: The relay has two coils (set & reset). Apply a positive pulse (10-50ms) to the set coil to close the contacts; apply a positive pulse to the reset coil to open the contacts. Do not apply continuous voltage – pulse operation only.
- PCB footprint verification: Check the pinout diagram (available in the datasheet). The NT95L-A-D-Z follows standard PCB through-hole spacing – ensure correct hole alignment before soldering.
- Wave soldering / hand soldering: Recommended soldering temperature ≤260°C for ≤5 seconds. Avoid flux penetration into the sealed body.
- Initial cleaning (if required): Use only isopropyl alcohol or approved solvents – do not immerse the relay in ultrasonic baths.
- Functional test in circuit: Apply a short pulse (20ms typical) to the set coil and verify closed contact resistance (<100mΩ). Then apply a reset pulse and check open circuit insulation.
- System integration: For high-inductive loads (motors, solenoids), add external flyback diodes or snubbers to protect the relay contacts.
Pro tip: Because this is a Latching Relay, the state is remembered even after power loss – ideal for applications where fail-safe position retention is critical.
Application Scenarios & Key Benefits for Buyers
Primary Applications
- Smart energy meters (AMI / prepaid meters): The relay’s low coil power (0.3W) and latching feature enable utility-grade remote connect/disconnect without draining the meter’s backup battery.
- EV charging stations (AC & DC chargers): 50A contact rating matches Level 2 and DC fast charger output contactors, reducing heat buildup and improving efficiency.
- PV solar combiner boxes & battery storage: Bistable operation ensures minimal self-consumption – critical for off-grid systems.
- Industrial power supplies & UPS: Fast switching (≤4ms) and high dielectric strength provide reliable bypass or load transfer.
- Home energy management systems (HEMS): Compact size (<3g) allows dense PCB placement alongside Automotive Relay or Solid State Relay modules.
Direct Value to International Buyers
- Reduced system cost: Eliminate continuous coil drivers and heat sinks – save on BOM and assembly.
- Improved energy efficiency: Near-zero holding power consumption (only during pulse) – ideal for green certifications (Energy Star, ErP).
- Enhanced reliability: Sealed construction prevents contact oxidation, ensuring stable resistance over 10⁵ electrical cycles – lowers field return rates.
- Flexible supply chain: As a core item in YM’s New Energy Relay and Industrial Power Relay categories, the NT95L-A-D-Z is backed by consistent production capacity and global logistics support.
By choosing YM’s NT95L series, procurement professionals gain a drop-in replacement for many legacy 50A latching relays, with improved coil sensitivity and tighter sealing specifications.
Certifications & Compliance
- RoHS 2011/65/EU compliant – free from restricted hazardous substances.
- REACH (EC 1907/2006) – SVHC declaration available upon request.
- ISO 9001:2015 certified manufacturing facility – full traceability and quality management.
- UL / cUL recognized (pending – contact YM for latest status) – suitable for North American markets.
- Vibration & shock resistance: Meets IEC 60068-2-6 (10-55Hz, 1.5mm amplitude) – robust for transportation and industrial environments.
Each production lot undergoes 100% coil resistance, contact voltage drop, dielectric strength, and leakage testing. Third-party test reports are available on request.
Customization Options
YM understands that different applications require tailored solutions. For volume orders, we offer the following customizations on the NT95L-A-D-Z platform:
- Coil voltage variants: Custom DC voltages (6V, 48V, etc.) and coil resistance optimization.
- Contact material upgrade: Silver tin oxide (AgSnO₂) for DC heavy loads or silver nickel (AgNi) for AC resistive.
- Pin shape & length: Straight PCB pins, bent leads, or custom terminal plating (gold over nickel for low-level signals).
- Sealing grade: Hermetic (standard) or epoxy sealed for extreme humidity/salt spray environments (IP67 equivalent).
- Latching polarity marking: Custom laser marking with your logo or part number.
Minimum order quantities for custom options apply. Our engineering team provides full support to integrate the customized Latching Relay into your existing PCB layout without requalification.
Production Process & Quality Assurance
YM’s automated production lines for Latching Relay and Polarized Relay families follow a strict process control plan:
- Incoming material inspection: 100% testing of magnetic steel, copper wire, and contact materials – sourced from approved ISO suppliers.
- Coil winding & encapsulation: Automated winding with real-time resistance monitoring; vacuum impregnation for moisture resistance.
- Contact assembly in Class 1000 cleanroom: Precision alignment of moving and stationary contacts – ensures low contact resistance.
- Hermetic sealing & leak detection: Helium leak testing (mass spectrometer) guarantees ≤10⁻³ Pa·cm³/s.
- 100% final functional test: Each relay is pulsed to set/reset states while measuring contact resistance, insulation voltage, and timing parameters.
- Statistical process control (SPC): Key characteristics (pull-in voltage, contact bounce) are monitored across every batch to ensure Cpk ≥1.33.
With over a decade of experience in Military Metal Relay and Aviation Switch production, YM applies the same rigorous standards to our industrial relay lines. The NT95L-A-D-Z is built to perform consistently from the first unit to the millionth.
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