The POPULACE SX440 automatic voltage regulator is a half-wave, phase-controlled thyristor AVR designed for brushless generator sets from 50 to 300kW, covering 150kW diesel generator applications and above. The SX440 automatic voltage regulator controls output voltage to within 1% and responds within 20ms, restoring machine volts to 97% of set point in approximately 300ms after a load transient. The SX440 automatic voltage regulator incorporates under-frequency roll-off, sensing loss protection, and droop circuitry for parallel operation. POPULACE supplies the SX440 automatic voltage regulator as a direct replacement for Stanford SX440 and compatible brushless alternator designs, with equivalent electrical ratings and a standard wiring interface.

Stable output voltage is the foundation of any reliable generator set, and the SX440 automatic voltage regulator is built specifically for this role in brushless alternator excitation systems. The SX440 automatic voltage regulator senses single-phase AC output and uses thyristor phase control to adjust field excitation continuously, keeping output voltage within 1% as load changes. When a load step occurs, the SX440 automatic voltage regulator corrects at the AVR level within 20ms, fast enough for most commercial and industrial standby applications.

The SX440 automatic voltage regulator accepts an input range of 190-264V AC, delivering up to 90V DC output at 207V AC input, with 4A continuous and 6A intermittent field current. The SX440 automatic voltage regulator includes an external voltage trim that accepts a 1k ohm resistor for 10% set-point adjustment, convenient during commissioning or when the generator is transferred to a new application. The SX440 automatic voltage regulator also accepts a 5V DC analogue signal for remote voltage control, integrating directly with automatic synchronizing or load management systems. For generators running in parallel, the SX440 automatic voltage regulator includes quadrature droop circuitry for reactive load sharing between units.

Precise 1% Voltage Regulation: The SX440 automatic voltage regulator maintains output voltage within 1% across the full load range through closed-loop thyristor phase control. The SX440 automatic voltage regulator 20ms AVR response and 300ms machine recovery time are well-matched to the transient dynamics of 50-300kW brushless alternators.

Under-Frequency Roll-Off Protection: The SX440 automatic voltage regulator includes a built-in under-frequency circuit, set at 95% of rated frequency and rolling off at 170% per Hz down to 30Hz. This SX440 automatic voltage regulator function limits excitation during engine underspeed, a common source of AVR and alternator damage during start-up and overload recovery. The SX440 automatic voltage regulator activates this protection automatically without external sensing.

Analogue Remote Trim Input: The SX440 automatic voltage regulator accepts 5V DC for remote voltage adjustment, with 1V input producing 5% output voltage change. This SX440 automatic voltage regulator feature integrates with synchronizing panels and power management systems, enabling external control without replacing the module.

Droop for Parallel Operation: The SX440 automatic voltage regulator provides quadrature droop (10 ohm burden, max 0.07A sensitivity for 5% droop) for reactive load sharing between parallel generators. Operators configure the SX440 automatic voltage regulator droop setting during commissioning to balance reactive load distribution across generator sets.

The SX440 automatic voltage regulator half-wave thyristor design provides consistent excitation control across the full load range without the temperature sensitivity that affects simpler linear regulator designs. The SX440 automatic voltage regulator thermal drift of 0.04% per degree Celsius means voltage set point stays stable across generator enclosure temperatures from -40 to +70 deg C, covering outdoor and remote installations where ambient swings are significant.

The SX440 automatic voltage regulator 20ms response at the AVR level, combined with 80ms field current rise and 300ms machine voltage recovery, is well-calibrated for 50-300kW brushless alternators. Generator sets fitted with the SX440 automatic voltage regulator recover from load transients without excessive overshoot or hunting, because the SX440 automatic voltage regulator includes stability, trim, and optimum response selection adjustments on the PCB. These allow a commissioning engineer to tune the SX440 automatic voltage regulator to the specific alternator and engine without external test equipment.

For systems running multiple generators in parallel, the SX440 automatic voltage regulator droop circuit and analogue trim input operate simultaneously, enabling reactive load sharing and external voltage control at the same time. This simplifies integration into automatic synchronizing panels managing reactive loading across multiple generator sets using the SX440 automatic voltage regulator.

The POPULACE SX440 automatic voltage regulator suits a broad range of generator set types and environments:

150kW Diesel Generator Sets: The SX440 automatic voltage regulator is widely used in diesel generator sets in the 50-300kW power range. For 150kW diesel generators, the SX440 automatic voltage regulator maintains stable output through varying load cycles, with its fast response keeping voltage within 1% even under step-load conditions.

Industrial Standby Power: Data centers, manufacturing plants, and critical facilities running brushless generator sets for standby power rely on the SX440 automatic voltage regulator for voltage stability. The SX440 automatic voltage regulator 1% regulation and sensing loss protection reduce equipment damage risk from voltage excursions during generator operation.

Marine and Mobile Generators: The SX440 automatic voltage regulator operating temperature range of -40 to +70 deg C and vibration tolerance up to 3.3g at 2kHz make it suitable for marine generator sets and vehicle-mounted generators where conditions exceed standard stationary installation limits.

Generator Overhaul and Replacement: Generator service workshops and alternator repair centers stock the SX440 automatic voltage regulator as a standard field-replacement component for Stanford and compatible brushless alternators. The SX440 automatic voltage regulator compatibility with the original Stanford design makes it a practical drop-in during overhaul.

For generator parts distributors, service workshops, and OEM operations, the POPULACE SX440 automatic voltage regulator offers a cost-effective alternative to branded Stanford replacements. The SX440 automatic voltage regulator functional compatibility with the original Stanford wiring interface means distributors can supply field technicians with a drop-in SX440 automatic voltage regulator without requiring alternator rewiring or additional commissioning work. POPULACE stocks the SX440 automatic voltage regulator for 2-3 day dispatch, with 3-7 day production lead times for volume orders. Each SX440 automatic voltage regulator carries a 1-year factory warranty, and POPULACE ships the SX440 automatic voltage regulator worldwide via FedEx, DHL, UPS, TNT, and Aramex.