AVR SX460 Stamford Generator Voltage Regulator, Automatic 1-Phase 50-60 Hz

AVR SX460 Stamford Generator Voltage Regulator is an analogue automatic voltage regulator used in the excitation system of compatible generator alternators.

It works with the generator's stator and exciter field to control the output voltage. The SX460 uses closed-loop voltage control to help maintain stable generator voltage when the load changes.

The SX460 is a self-excited AVR and was previously used with STAMFORD UC22 and UC27 alternators. Since the SX460 is now listed by STAMFORD | AvK as obsolete and superseded by the AS440, users should check the generator model, wiring and electrical ratings before selecting this unit as a replacement.

Key Features

• Analogue automatic voltage regulator design
• Suitable for compatible self-excited generator systems
• 50-60 Hz nominal operating frequency
• Jumper-selectable sensing input
• 95-132 VAC or 190-264 VAC sensing range
• Maximum output of 90 VDC at 207 VAC input
• Continuous output current up to 4 A DC
• Intermittent output current up to 6 A for 10 seconds
• Voltage regulation of approximately ±1% under specified conditions
• Under-frequency protection
• External voltage adjustment support
• Fast AVR response of around 20 ms

Applications

The SX460 can be used in compatible generator excitation systems where its electrical specifications match the original AVR.

It is suitable for applications such as:

• Diesel generator sets
• Standby power generators
• Industrial generator systems
• Commercial power backup systems
• Compatible STAMFORD alternators
• Generator AVR replacement and maintenance work

Always check the generator's existing AVR model and wiring before installation.

Technical Benefits

The SX460 provides automatic control of the generator excitation system. This helps the alternator maintain its required output voltage as operating conditions change.

Its under-frequency protection helps reduce excitation when generator speed falls below the set point. The unit also supports external voltage adjustment for suitable installations.

The specified AVR response is about 20 ms. The field current can reach 90% in about 80 ms, while machine voltage can reach 97% in about 300 ms under the stated test conditions.

Industry Usage

This generator voltage regulator is intended for professional generator service, repair and maintenance applications.

It can be considered for industrial facilities, commercial backup power systems, generator service workshops and other installations using compatible STAMFORD alternators.

For replacement work, the original AVR specifications should be compared with the SX460 before installation. This is especially important for sensing voltage, frequency, phase, excitation output and generator wiring.

Performance Advantages

The SX460 provides controlled excitation to help maintain generator voltage during changing load conditions. Its closed-loop design allows the AVR to monitor generator voltage and adjust excitation accordingly.

With specified regulation of ±1% and a fast response, the unit is designed for stable voltage control in compatible generator systems.

For accurate replacement selection, always confirm the alternator model, existing AVR part number and electrical connections. STAMFORD | AvK identifies the SX460 as an obsolete product and recommends checking the AS440 as its successor.