VTN Company logo
VTN Company logo
Made with a respect to You
Made with a respect to You


Multifunctional voltage regulator 9888.3702


Multifunctional voltage regulator 9888.3702
General information
Connection diagram
Dimensional drawing


General information:

The multifunctional voltage regulator 9888.3702 is purposed for voltage maintenance of the vehicle power network in predetermined limits in all system operation modes of electrical equipment at change of the rotation frequency of the alternator rotor, electrical load and environment temperature.

Applicability: high power consumption automotive vehicles (transit and city buses, heavy vehicles, motorhomes, trucks, etc.) with high power brushless alternators A203-T1 28V/400A, A203/01/28V 400A, А205 28V 400A, А203/21/28V 400A, A203/11/28V 400A, A203/20/28V 330A manufactured by DYNAMO Sliven (Bulgaria), in which transited voltage suppressors (called also Avalanche, and Zener diodes) are used.

Voltage regulator 9888.3702 provides complete disconnection of the alternator excitation winding from the power network, which increases the reliability and safety of the power supply system.

The regulator provides a smooth increase in load current.

Voltage control and regulation are carried out directly at the alternator output terminal.
The regulator has a noise suppression capacitor.

The multifunctional voltage regulator 9888.3702 is produced in a single climatic design О2.1 in accordance with GOST 15150 for internal market and for export. On extent of protection against penetration of foreign bodies and water, the item meets design IP67 in accordance with GOST 14254. An operating mode of the regulator is S1 in accordance with GOST 3940.

The regulator is mounted directly on the generator, where the fastening of 9888.3702 is provided with standard screws.

The warranty period of exploitation is 3 years from the date of commissioning or from the date of sale in retail commercial network. The warranty obligations of the manufacturer are valid during 4 years from the date of the item production. The date of production is marked on the case of the item.


Range of operating temperatures, °С
between -40 to +85
  Regulation voltage with automotive battery at t°=25°С, alternator load 10A and rotation speed 6000 rpm, V
28,5 ± 0,2
  Maximum current of output circuit, А
  Thermal compensation of regulating voltage, Uрег, mV/°С
-10 ± 2
  Prolonged overvoltage, V
Maximum allowable impulse overvoltage when it is composed in the alternator with a duty cycle of not more than 10%, V
- with a pulse duration of no more than 500 ms
- with a pulse duration of no more than 10 ms
  Maximum current of the "IGN" line, mA
Maximum total current of the "IGN" and "B +" lines (ignition is switched on without rotation of alternator), mA

Connection diagram as part of the alternator installation:

Схема включения регулятора напряжения 9888.3702

Dimensional drawing:

Габаритный чертеж регулятора напряжения 9888.3702
VTN © 2000-
The reference to a www.vtnauto.com is obligatory at full or partial use of materials