Products Description
SX460 Generator AVR | Universal Automatic Voltage Regulator for Brushless Self-Excited Generator Alternators
Half-Wave Phase-Controlled Thyristor AVR Module with Adjustable Voltage & Stability Trimpots, Under-Frequency Protection, LED Status Indicator & Potted Construction
SX460 Generator AVR
The SX460 is the industry-standard universal automatic voltage regulator for brushless self-excited generator alternators - the electronic control module that maintains a stable alternating current output voltage regardless of engine speed fluctuations, load changes, or temperature drift. It functions as a closed-loop feedback controller: the AVR continuously senses the generator's output voltage through its sensing input terminals, compares it to an internal precision reference, and adjusts the direct current fed to the alternator's exciter field winding to correct any voltage deviation within milliseconds. Without a functioning AVR, the generator's output voltage collapses as load is applied, or surges dangerously high under no-load conditions - either scenario damages connected equipment or causes the generator's protection circuits to trip.
Technical Profiles & Materials
Under-Frequency (U/F) Protection ：
When the generator engine speed drops below a preset frequency threshold - typically 46–48 Hz for 50 Hz systems - the SX460 proportionally reduces the output voltage. This protection is critical during engine start-up and shut-down, or when the engine momentarily bogs under a sudden heavy load. Without U/F protection, the AVR would attempt to maintain full voltage at reduced frequency, causing saturation of the alternator's magnetic core, excessive excitation current, and potential burnout of the exciter field winding.
Adjustable VOLT & STAB Trimpots ：
Two blue square trimpots with white adjustment dials provide field-tuning capability: (1) The VOLT trimpot adjusts the nominal output voltage setpoint, typically providing a ±10% adjustment range. This allows the generator output to be trimmed to precisely 220 V, 230 V, or 240 V to match the local grid standard or compensate for long cable-run voltage drops. (2) The STAB trimpot adjusts the regulator's feedback loop damping - increasing stability prevents voltage oscillation (hunting) that causes flickering lights and unstable equipment operation; reducing stability improves transient response to sudden load changes.
Technical Specifications
| ITEM | DETAILS |
| Type | Universal Automatic Voltage Regulator - Half-Wave Phase-Controlled Thyristor |
| Application | Brushless self-excited generator alternators 5–500 kVA: Stamford, Leroy Somer, Mecc Alte & compatible universal platforms, 50/60 Hz, 220/380/440V systems |
| Code | 1609290 |
| Material | Epoxy/polyurethane potted PCB assembly in black plastic housing, SCR power device with integrated aluminium heatsink |
| Details explanation | Half-wave thyristor regulation. Adjustable VOLT (±10%) & STAB trimpots. Under-frequency protection (46–48 Hz for 50 Hz). LED status indicator. 10-pin terminal block. 4-corner mounting holes. Potted construction. |
| Brand Name | SeaSummer |
| Operating Temp | −20 ~ +70 °C (ambient) |
| Delivery Time | 30 Days |
| Packaging | Cardboard packaging |
Products Application
Generator Set Manufacturing & Custom Build Integration
For manufacturers and system integrators building custom generator sets, the SX460 provides a proven, low-cost regulation solution with minimal integration engineering. The standardized 10-pin interface and self-excited operation (the AVR is powered from the generator's own output, requiring no external power supply) simplify wiring: connect the sensing input to the generator output phases, connect the field output to the exciter stator, and the system is operational after basic trimpot adjustment. The potted construction meets the vibration and environmental standards required for generator-mounted electronics, eliminating the need for a separate weatherproof enclosure.
AVR Failure Replacement & Generator Restoration
An AVR failure is the most common electrical fault on a brushless generator - typically caused by voltage spikes from load switching, lightning-induced surges on the output cables, or moisture ingress into an un-potted regulator housing. Symptoms of AVR failure include: no output voltage from the generator (AVR not delivering excitation current), output voltage stuck at residual level (typically 5–15 V), voltage surging or oscillating (STAB trimpot misadjustment or component degradation), or voltage that collapses as soon as load is applied (failed SCR or sensing circuit). Replacing the AVR with an SX460 - and correctly setting the VOLT trimpot to the required output voltage - restores full generator functionality in under 30 minutes.
Universal Brushless Generator Voltage Regulation
The SX460 is the most widely deployed universal replacement AVR for brushless generator alternators from 5 kVA to 500 kVA. Its standard 10-pin terminal interface and common sensing voltage range (190–264 V AC) make it compatible with Stamford UC, BC, and HC series alternators; Leroy Somer AREP and SHUNT excitation alternators; Mecc Alte and Linz alternators; and virtually all universal and Chinese-manufactured brushless alternators sharing the same excitation topology.For generator dealers, rental companies, and field service technicians, stocking the SX460 as a universal spare covers the AVR replacement needs of a mixed-brand generator fleet without carrying model-specific regulators for each alternator brand.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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