Bronson MII 500

The Bronson MII 500 is a versatile isolation transformer with step-up capability — the reliable choice for workshops, marine applications and lab environments that need safe isolated 230V power from any mains voltage.

Max. 500W / Continuous 400W — powers workshop instruments, marine electronics and audio equipment safely
Step-up + galvanic isolation in one — accepts 110V or 230V and delivers fully isolated 230V output
Safe in wet environments — galvanic isolation is the standard for electrical safety on boats and in damp workshops
No shared ground — completely eliminates the risk of stray currents and ground faults
Ideal for — marine electronics, service workshops, dental and medical equipment, recording studios

Plug Type
- EU
- UK
Condition
- NEW
- USED

110.08 € 131.00 €

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Bronson MII 500 — Isolation Transformer 400W

Isolation transformer with galvanic isolation for workshop, marine and vintage hi-fi. 400W continuous, automatic 110/230V input, isolated 230V output.

500VA toroidal core — 400W continuous at 98%

The toroidal transformer delivers up to 500W peak and 400W continuous over 15 minutes. Its 98% efficiency keeps heat and load hum low — suited to audio equipment, test instruments and workshop tools.

Automatic 110/230V input — isolated 230V out

The MII 500 accepts 110V or 230V at the input automatically and always delivers galvanically isolated 230V. It steps up from a 110V supply or runs one-to-one from 230V.

Schuko Type F, IEC input — single-phase 50/60 Hz

Input runs through an IEC cable with a Schuko Type F plug; the output is a Schuko Type F socket. Single-phase at 50/60 Hz, matching European line frequency and local voltage.

Use case 01

Vintage Hi-Fi

1970s stereo system running on galvanically isolated 230V

Frequently asked questions

Can the Bronson MII 500 be used in split-phase applications?

Yes, the MII 500 can be used in split-phase applications.

It provides a galvanically isolated output that can be wired as split phase. To tie into a line-neutral system, one output pin must be grounded so neutral and protective earth are defined.

Does the MII 500 isolate input and output in both directions?

Yes, the MII 500 isolates input and output galvanically in both directions.

The primary and secondary windings are physically separate, with no shared conductor. The isolation holds regardless of feed direction — at a 110V or a 230V input.

Is the MII 500 suitable as an isolation transformer for vintage hi-fi?

Yes, the MII 500 works as an isolation transformer for vintage hi-fi systems.

Its galvanic isolation suppresses ground-loop hum, and the pure sine wave delivers clean power for 1970s and 1980s stereo systems and tube amplifiers such as Onkyo, Nakamichi or Teac.

Does the MII 500 have a soft-start?

Yes, the MII 500 has a built-in soft-start that limits inrush current.

The inrush limiting tames the toroidal transformer's switch-on surge, so the circuit breaker (3A at 230V, 6A at 110V) does not trip at power-up.

Our technology.

Automatic 110/230V input selection

The MII 500 accepts both 110V and 230V at the input without a selector switch. The transformer winding sets the output from the applied voltage: it doubles 110V and passes 230V through one-to-one. The output always carries galvanically isolated 230V, whether the unit runs on a 110V or a 230V supply. One setup works on European and North American power alike, with no extra converter.

Galvanic isolation, floating output

The primary and secondary windings are physically separated. No continuous protective-earth path runs between input and output — the output is galvanically isolated and floats. This blocks stray currents and ground loops between the supply and the connected device. In audio setups it removes ground-loop hum; in damp environments it lowers the risk of fault-current paths.

Specifications - Bronson MII Series compared

Specification	Bronson MII 500 Bronson MII 500	Bronson MII 1000 Bronson MII 1000	Bronson MII 2000 Bronson MII 2000	Bronson MII 3000 Bronson MII 3000	Bronson MII 6000 Bronson MII 6000	Bronson MII 8000 Bronson MII 8000
Maximum Power	500 W	1000 W	2000 W	3000 W	6000 W	8000 W
Continuous Power	400W	800W	1600W	2400W	4800W	6400W
Input Voltage	100 - 120V AC or 200 - 240V AC
Input Connection	IEC cord with Schuko Type F plug			Screw Terminal
Output Voltage	200 - 240V AC (corresponds to input voltage or twice the input voltage)
Output Connection	Schuko Type F socket			Schuko Type F / British Type G / Screw Terminal
Transformer Type	Toroidal core
Efficiency	98 %
Phase	Single phase
Wave form	Sine wave - no distortion
Display	Green LED to indicate Power on
Soft Start	Yes				No
Galvanic Isolation	Yes
Overcurrent Protection	Air switch: 6A 230V	Air switch: 16A 110V	Air switch: 16A 230V		Air switch: 50A 230V	Air switch: 63A 230V
Short Circuit Protection	Circuit breaker: 3A 230V	Circuit breaker: 4A 110V	Circuit breaker: 7A 230V	Circuit breaker: 12A 230V	Circuit breaker: 15A 230V (max. power per socket 3450W)
Overheat Protection	Yes				Fan for cooling the core when overheating
Frequency	50/60 Hz
Product Dimensions (H x L x W)	10.0 x 20.6 x 19.2 cm	12.4 x 22.6 x 21.7 cm	14.9 x 26.8 x 25.7 cm		16.7 x 36.2 x 35.0 cm
Weight	5.7 kg	7.5 kg	12.8 kg	15.0 kg	26.4 kg	30.6 kg