Kstar-Style Plum-Blossom 4-Pin Female Solder-Wire Connector, Tin-Plated with M22×1.0 Lock Nut & Sealing O-Ring

This Kstar-Style plum-blossom 4-pin female solder-wire waterproof connector is developed for energy-storage inverters, UPS power supplies, photovoltaic auxiliary cabinets and industrial power-signal mixed interconnection scenarios. Equipped with M22×1.0 threaded lock nut and silicone sealing O-ring as standard parts, it acts as the female mating receptacle for the matching plum-blossom male plug. It solves common industry pain-points such as unreliable panel fixing, insufficient sealing performance, poor solderability and high harness-processing cost for power-supply equipment manufacturers and harness factories.

First of all, M22×1.0 screw-lock structure provides stable panel-mount fastening together with panel-side IP67 sealing. Many competing circular connectors require customers to source lock nuts and gaskets separately, which risks thread mismatch, gasket mis-alignment and degraded waterproof performance. This Kstar-Style female connector ships complete with original-factory M22×1.0 lock nut and silicone O-ring. When installing onto equipment cabinet panels, users pass the connector body through M22 mounting hole, fit the silicone O-ring between housing shoulder and panel surface, then tighten the M22×1.0 lock nut from cabinet interior. Compressed O-ring fills panel gap completely, blocking dust, rainwater and humid air from penetrating through panel mounting hole into cabinet interior. Threaded screw-on locking delivers far stronger anti-pull-out performance than simple snap-lock structures. Even under continuous mechanical vibration generated by inverters and UPS devices, the connector will not rotate, loosen or fall off from cabinet panel. The M22×1.0 thread dimension follows mainstream industry standard for energy-storage equipment, ensuring interchangeability with compatible market counterparts.

Second, tin-plated female contacts realize excellent solderability and high cost-efficiency. Female contact sockets adopt copper alloy substrate with uniform tin-plated surface. Tin plating delivers superior wetting performance during soldering work. Harness workshops can obtain stable soldering joints with ordinary soldering stations, greatly reducing virtual-solder and cold-solder risks during mass harness production. Under conventional indoor and semi-outdoor industrial environments, tin-plated contacts maintain low-resistance circuit conduction, fully meeting mixed power-and-signal transmission requirements of energy-storage and UPS systems. Comparing with gold-plated alternatives, this tin-plated version effectively lowers component procurement cost while satisfying most project specifications, becoming an economical choice for large-volume power-equipment projects.

Third, solder-wire termination brings high harness-building flexibility. This female receptacle applies solder-wire tail design instead of crimp-style contacts. Equipment developers and harness manufacturers do not need to invest in expensive automatic crimping machines or special crimp dies. R&D prototype verification, small-batch trial-run and large-scale production can all be accomplished by manual or semi-automatic soldering. According to actual current load and wiring-space limitation, customers can select stranded copper wires within AWG20-14 range. It removes restrictions from fixed crimp terminal specifications, shortens new-product development cycle and lowers production-tooling investment threshold.

Fourth, plum-blossom circular pin layout plus anti-mis-mating polarization improves field-installation safety. Unique plum-blossom 4-pin circular arrangement optimizes space utilization for circular panel cut-outs. Built-in polarization keying on housing defines only one correct mating orientation. Field installers cannot insert male plug in reversed or wrong angle, effectively preventing pin bending, short-circuit and equipment damage caused by human mis-operation. High-grade PA66 flame-retardant housing possesses outstanding impact resistance and UV-aging resistance. When deployed on outdoor power cabinets, housing resists cracking, embrittlement and fading under long-term sunlight exposure and wide temperature fluctuation. Internal insert firmly holds four female sockets, preventing contact shifting or loosening under mechanical shock. Compact outer dimension saves precious panel space on energy-storage and UPS cabinets.

Fifth, strict full-range manufacturing quality control guarantees batch consistency. Every production batch goes through multi-step inspection: raw-material incoming check, contact-plating-thickness sampling test, thread dimensional verification, O-ring compression sealing test and finished-product electrical-performance spot-check before shipment. Anti-static packaging protects precision tin-plated female contacts from static discharge and surface contamination during logistics. Material statements and test documentation can be provided for project bidding and internal quality archive. This Kstar-Style connector maintains interchangeable mating dimensions matching mainstream energy-storage power connectors on the market, helping customers realize cost-reduction without sacrificing connection reliability.

Benefiting from plum-blossom 4-pin layout, 10A per-pin current capacity, M22 panel-mount capability and IP67 environmental performance, this Kstar-Style female solder-wire connector is widely used for mixed power-and-signal interconnection inside new-energy power equipment, industrial power supplies and outdoor control cabinets.

3.1 Energy-Storage & UPS Power Systems It serves as cabinet-panel female receptacle for energy-storage inverters, household energy-storage battery cabinets, on-grid/off-grid UPS power supplies and backup power modules. Four-pin configuration supports combined transmission of low-voltage power lines and BMS monitoring signals. M22 threaded panel-mount together with silicone O-ring ensures cabinet-wall sealing, stopping rain and dust from entering power cabinet. Anti-vibration screw-locking adapts to continuous vibration generated by inverter operation.

3.2 Photovoltaic Auxiliary Power Cabinets Applied for distributed PV combiner boxes, photovoltaic inverter peripheral control cabinets and outdoor power distribution units. Installed on cabinet outer panel, this connector connects internal control circuits to external harness. IP67 sealing protects internal electronic components against outdoor weather conditions. Standard M22 mounting thread simplifies cabinet mechanical design for PV equipment OEMs.

3.3 Industrial Power Supply & Control Cabinets Suitable for industrial switching power supplies, automation control cabinets and field-deployed power distribution boxes. It realizes external power-signal harness interface for cabinet equipment. Screw-tightened M22 lock nut guarantees stable mechanical fixation even in vibration-prone factory workshops. Solder-wire termination supports custom harness development for different cabinet projects.

3.4 Outdoor Communication & Monitoring Power Equipment Used for outdoor communication power units, environmental monitoring power cabinets and roadside intelligent equipment power interfaces. Working under large day-night temperature swing and rain-dust exposure, the complete sealing system prevents moisture ingress. Plum-blossom 4-pin design balances power-carrying capability and compact panel occupation.

3.5 Special-Purpose Mobile Power Equipment Applied for portable emergency power stations, mobile energy-storage devices and field power-supply units. The connector endures frequent handling, vibration and splash-water conditions. Reliable screw-locking avoids accidental disconnection during transportation and field operation.

3.6 New-Energy Equipment Testing & Aging Test Stands Widely adopted on energy-storage product aging test benches and power-equipment debugging fixtures. Solder-wire construction facilitates quick prototype modification and test-harness making. Stable electrical performance ensures repeatable test data during long-time aging runs.

Q1: What IP protection level can this Kstar-Style plum-blossom 4-pin female connector achieve?
A: It reaches IP67 rating when three conditions are satisfied: connector fastened onto panel with M22×1.0 lock nut, silicone O-ring correctly fitted against panel surface, and fully mated with matching male plug. IP67 provides dust-tight protection and resistance against multi-direction low-pressure water splashing. This product is NOT designed for continuous underwater submersion. For IP68 deep-water requirements, please contact our technical team for customized solution.

Q2: Are M22×1.0 lock nut and silicone waterproof O-ring included within standard supply?
A: Yes. Both M22×1.0 threaded lock nut and silicone sealing O-ring are standard supplied accessories together with female connector housing and contact insert. No separate gasket or nut purchasing is needed for standard panel-mount assembly.

Q3: Is this solder-wire type or crimp-contact type? Can crimp terminals be assembled?
A: This is solder-wire-termination female receptacle. Contact tails are designed for wire soldering. Standard version does not support crimp terminals. You need to solder stranded copper wires onto contact tails by soldering iron. If you need crimp-contact variant for large-scale automatic harness production, please ask our sales for alternative model.

Q4: What wire gauge is recommended for soldering? What is per-pin current rating?
A: Recommended stranded copper wire range: AWG 20-14. Continuous rated current for each single female pin is 10A. Please do not exceed this rated current in practical application to avoid abnormal heating and circuit failure.

Q5: Can I omit silicone O-ring or skip tightening M22 lock nut during panel installation?
A: Not allowed. Omitting O-ring will lose panel-side waterproof and dust-proof sealing completely. Insufficient tightening of M22×1.0 lock nut will cause connector rotation and loose fixation under vibration, leading to sealing failure and bad contact. For outdoor and dusty industrial usage, O-ring must be correctly placed and lock nut must be fully tightened.

Q6: Does this product include the matching plum-blossom male plug?
A: This listing only supplies Kstar-Style plum-blossom 4-pin female solder-wire connector, M22×1.0 lock nut and silicone O-ring. Corresponding male plug is sold separately. Please notify our sales if you need complete male-female mating sets.

Q7: Can you provide customization service?
A: Customization is available for large-volume orders. Supported custom items include adjusted contact plating thickness, special housing color, minor housing-structure modification. Minimum-order-quantity terms apply for customized projects. Please send your detailed technical requirements to our business email for evaluation and quotation.

Q8: Can I get engineering samples for pre-production testing?
A: Yes, test samples are available for customer performance and docking verification. Sample cost and freight shall be borne by customer. Sample lead-time depends on stock availability.

Q9: What is operating temperature range and mating-cycle service life?
A: Standard operating temperature: -40℃ ~ +85℃. Minimum mechanical mating cycles: 500 times. For scenarios with extremely frequent plug-unplug actions, please contact us for enhanced-contact solution.

Q10: Are raw-material certificates and performance test reports available?
A: We can provide sampling electrical-performance test reports and raw-material compliance statements for project filing. Please submit your document demand via our official contact channel.

If you have technical consultation, sample application, bulk-order quotation or customized-solution demand for Kstar-Style Plum-Blossom 4-Pin Female Solder-Wire Connector with M22×1.0 Lock Nut & Waterproof O-Ring, please feel free to get in touch with our professional sales and technical-support team.

Our team accumulates rich practical experience in industrial circular waterproof connectors, photovoltaic & energy-storage interconnection components and wiring-harness accessories. We are capable of providing technical-parameter confirmation, mating-model recommendation, project-oriented customization suggestions and full-order-progress tracking service for your specific application scenarios.