Quick Answer: The Lockmaster Power Unit is a general purpose power supply giving 0 - 15V ac or unsmoothed dc in 1V steps at up to 8.5A, with a key-operated maximum voltage lock.
Last updated: October 2026
Key Features
Output in 1V steps up to 15V via rotary switch
Adjustable maximum voltage lock, set with the key provided
Continuously rated 8.5A, a.c. or d.c.
Relays allow switching at full load without contact wear
Green-to-red overload LED
Internal fan for cool running
Technical Specifications
Specification
Value
Output
ac and dc, 1 - 15V, stepped, lockable
Maximum current
8.5A combined
Fuse rating
1A time delay
Ratings
230Vac 50Hz 180VA
Temperature rating
10 - 40°C
Humidity
10 - 90 %RH
Dimensions
175 x 190 x 298mm (W x D x H)
Mass
4.8kg
About This Product
The lock suits student work where components may be damaged by over-voltage: a teacher or technician sets the highest voltage allowed and locks it. The ac and dc outputs may be used together while the combined current stays within 8.5A. Protection includes an electronic overload trip, a thermal transformer trip and a slow-blow primary fuse. Besides buyers across India, the Lockmaster Power Unit can be exported to institutions in Sudan, Mauritius, Kuwait, Turkmenistan, Estonia and Moldova.
Frequently Asked Questions
Q1. How does the voltage lock work? The maximum output voltage is locked to a chosen setting using the key provided, so the unit cannot be turned above that level.
