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Stamford AVRs and Spares

Genuine OEM AVR Automatic Volltage Regulators, Control Modules and Rectifier Repair kits to suit Stamford and Newage Alternators.


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STAMFORD AVR SELECTION

STAMFORD Automatic Voltage Regulator (AVR) & Accessory Selection Tables.

The table below will indicate which AVR accessory is available for, or incorporated into each product range.


 

MX321

MX341

SX421

SX460

AS440

AS480

DM110

P0/P1

N

N

N

N

N

S

N

UC22

O

O

O

S

O

N

N

UC27

O

O

O

S

O

N

N

HC4

O

O

O

N

S

N

N

HC5

O

O

O

N

S

N

O

HC6

S

N

N

N

N

N

O

P7

O

S

N

N

N

N

O

MV7

S

N

N

N

N

N

N

P80

N

N

N

N

N

N

S = Standard | O = Option | N = Not available

 

AVR Features

MX321

MX341

SX421

SX 460

AS440

AS480

DM110

Voltage
Regulation

0.5%

1%

0.5%

1%

1%

1%

+/- 0.25%

UL 1004
Compliant

No

Yes

No

Yes

Yes

Yes

Yes

Three Phase
Sensing

Yes

No

Yes

No

No

No

Yes

Sensing

Short Circuit Current Limiting

Yes

No

No

No

No

No

Yes*

Under Frequency
Protection

Yes

Yes

Yes

Yes

No

Yes

Yes

Load Acceptance
Feature UFRO

Yes

Yes

No

No

No

Yes

Yes

Accessories

Excitation
circuit breaker**

Yes

No

Yes

No

No

No

No***

RFI
suppressor kit

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Seperate
voltage trimmer

Yes

Yes

Yes

Yes

Yes

Yes

No****

Quadrature
droop kit (3 phase)

Yes

Yes

Yes

No

Yes

Yes

Yes

Power factor
controller - PFC3

Yes

Yes

Yes

No

Yes

No

Integrated into AVR

Remote
control interface

Yes

Yes

Yes

Yes

Yes

No

Integrated into AVR

Excitation
loss module

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Diode failure
detector

Yes

Yes

Yes

No

Yes

Yes

Yes

Alternator
protection module

Yes

Yes

Yes

No

No

No

Yes

Frequency
detection module

Yes

Yes

Yes

No

No

No

Yes

Dual AVR
(manual change over)

Yes

No

Yes

No

No

No

No

Manual
voltage regulator

Yes

Yes

No

No

No

No

Integrated into AVR

Line drop compensation

Yes

Yes

Yes

Yes

Yes

Yes

No

* Achieved by excitation voltage limiting.

** The excitation circuit breaker supports the overvoltage protection on the MX321.

*** Terminal rail allows external 2 or 3 pole circuit breaker to be used which breaks 2 or 3 phases of the PMG.  

Both functions are facilitated by the excitation circuit breaker on the SX421.

**** External voltage trimming is achieved using raise and lower switch contacts.