// Escape Room Prop — Industrial Series

Voltage Regulator
Puzzle - VR4

The voltage regulator has failed, preventing automatic voltage balancing. Players must manually adjust all three phase voltages to 230 V. Increasing one phase causes the other two to decrease as the neutral point shifts, requiring careful balancing of all three simultaneously to eliminate voltage asymmetry. The aging voltmeter has an unevenly illuminated LED display that flickers intermittently, suggesting years of wear and impending failure. When the player presses the output button, the defective relay chatters and flickers with a built-in arc flash effect instead of engaging, while a flashing fault indicator shows that the output cannot be energized. After replacing the faulty relay, pressing the button again produces immediate visual feedback: the relay clicks, the green "Output Voltage" LED illuminates steadily and the system powers up successfully. Every action produces live visual feedback, ending with a satisfying relay activation. A five-step electrical puzzle built into a metal cabinet. Designed and manufactured by Ediseja 21, a company with over 16 years of experience in designing and producing professional electronic systems.

VR4-Voltage Regulator Puzzle front face, showing LED voltmeter,
Front face — voltage regulator panel
VR4-Voltage Regulator Puzzle inside
Cabinet open — voltage regulator panel
// How players experience it
01
Switch the Fuse

The cabinet remains non-functional until the player locates the electric cabinet key hidden elsewhere in the room, opens the cabinet and switches on the fuses. The player can switch on the fuses in any order, but all fuses must be switched on for the cabinet to operate correctly.

VR4-Voltage Regulator Puzzle Close-up of the two NH00 fuse holders, ready to accept fuses
02
manual regulation

After booting up, the voltmeter displays an error indicating that automatic voltage regulation has failed. Voltage Unbalanced LED is activated. Players must switch to manual regulation to continue.

VR4-Voltage Regulator Puzzle Display with Error message
03
Adjust the Voltage

Players must manually adjust all three phase voltages to 230 V +-2% to eliminate Voltage Unbalanced LED. The player must use the manual switch to cycle through the phase voltages and determine which voltage is outside the acceptable limit.

VR4-Voltage Regulator Puzzle Asymmetry LED shuts down
04
Find the Fault

When the player presses the output button, the defective relay chatters and flickers with a built-in arc flash effect instead of engaging, while a flashing Output Voltage LED shows that the output cannot be energized.

VR4-Voltage Regulator Puzzle Close-up of the bridged fuse holder with wire
05
Replace the relay

After replacing the faulty relay, pressing the button again produces immediate visual feedback: the relay clicks, the green "Output Voltage" LED illuminates steadily and the system powers up successfully. Done.

VR4-Voltage Regulator Puzzle relay replacement VR4-Voltage Regulator Puzzle Voltage Out LED is illuminated
// System
∿ ∿ ∿

Strange voltage effect

Players increase one phase, causing the other two phases to decrease as the neutral point shifts.

⚡

Arc flash effect — the startle moment

When the player tries to engage the output relay, it flashes and crackles, and than immediately understanding why the relay needs to be replaced. The system operates entirely on low-voltage electronics.

🔴

Visual feedback at every step

LED indicators guide players through wiring and phase sequence without a single GM hint. The prop teaches itself.

🔄

Fast reset — under a minute

Switch fuses off. Lock the cabinet. Cycle power. Ready for the next group.

🔌

Relay output — plug and play

Dry contact NO/NC relay, 12 V enable input system. No custom wiring needed.

🏭

Fits any industrial theme

Metal cabinet, real industrial components (relay, fuses), real wire. Looks at home in sci-fi, bunker, power plant, or laboratory rooms — no decoration required.

🛡️

Built for daily use

Industrial-grade metal enclosure. Robust fuse holders. 12-month warranty. Designed to run multiple sessions a day, year-round.

// Technical specifications
Power supply9 - 12 V DC (adapter included)
OutputRelay — dry contact NO / NC
Relay rating5 A / 12 V AC/DC
ResetPower cycle, under a minute
Arc flash effect Simulated electrical arc with synchronized flash and sound · Operates entirely on low-voltage electronics
LED indicatorsRed - voltage unbalanced, green - voltage output
Display3× 32mm 7-segment LED
Controls3× fuse, 3x potentiometer, 1× 4-position selector switch
EnclosureMetal cabinet, industrial finish
Approximate dimensions400 × 300 × 200 mm
Approximate weight4.5 kg
Compatible themesSci-fi · Bunker · Power plant · Laboratory · Horror
Warranty12 months
Lead time3–4 weeks · Ships worldwide
// Pricing
1049 €
excl. VAT + shipping
Complete prop, ready to install. Everything you need to run the puzzle from day one.
  • Metal cabinet enclosure
  • Full electronics panel
  • Arc flash effect
  • Relay output (NO/NC)
  • 12V power adapter
  • Installation & reset instructions
  • Fuses (set of 3)
  • LED indicators (set of 1 unbalanced + 1 output)
  • LED display (3x 32mm - 7 segment)
  • Switch (1x 4 position)

Bring industrial realism to your next escape room.

Lead time 3–4 weeks. Ships worldwide. Custom orders and theming available on request.

Request a quote
// Contact

Company: Ediseja 21 d.o.o.

Address: Stegne 21C

City: 1000 Ljubljana

Country: Slovenia - EU

E-mail: grega.flander@ediseja21.com

// Gallery
VR4-Voltage Regulator Puzzle Front cabinet open, fuse chamber and wiring panel
Cabinet, front, unfinished
VR4-Voltage Regulator Puzzle Full cabinet open, fuse chamber and wiring panel
Cabinet, open, unfinished
VR4-Voltage Regulator Puzzle Front face of the cabinet with phase LEDs
Front face, finished