42 V | 200 Hz Converters

42 V / 200 Hz frequency converter (Enar, Husqvarna, Wacker Neuson) — how it works

A 42 V / 200 Hz frequency converter is a unit plugged into a 230 V mains socket or a 400 V three-phase socket, generating a safe 42 V output at a frequency of around 200 Hz. The converter has one output socket (or two), to which a hose with a vibrating poker is connected — it is the poker, immersed in fresh concrete, that actually vibrates and drives out trapped air. The converter itself has no working part in contact with the mix; its sole job is to transform power between the mains and the poker's hose.

The 42 V voltage falls within the SELV (Safety Extra-Low Voltage) range — even damaged insulation on the hose poses no shock risk to the operator, something equipment powered directly from a 230 V mains supply cannot guarantee. The frequency of around 200 Hz is four times the 50 Hz mains frequency and translates into up to 12,000 poker vibrations per minute — finer, faster vibrations that de-air a dense mix more quickly. That is why a converter is a mandatory part of every professional internal (poker) vibrating set.

Types of converters — single-phase 230 V or three-phase 400 V power

Converters differ mainly in their input power supply, meaning which socket on the jobsite they can run from.

With a 230 V socket, choose a single-phase model. With access to 400 V three-phase power, a three-phase converter keeps voltage stable during longer continuous work. The complete set — a converter and a matched poker — is in the parent 42 V / 200 Hz vibrators category, and the working head itself is in the 42 V / 200 Hz pokers with hose subcategory. Equipment from these brands is also available on the Wacker Neuson brand page.

Matching converter power and socket count to your poker

Converter power must cover the demand of the connected poker — an underpowered unit will not hold a stable frequency of around 200 Hz under load. The larger the poker head's diameter, the higher the converter power required, which is why large-diameter pokers are more often matched with three-phase 400 V units than with compact single-phase models.

The number of output sockets determines how many pokers can be connected to one converter at the same time. The Husqvarna CF11M has 1 socket and powers a single poker — typical for smaller, single-phase units. Some higher-power models, usually three-phase 400 V, have 2 sockets, letting you run two pokers at once — provided their combined power draw stays within the converter's rated capacity. The exact socket count for each model is given on the product page.

Popular frequency converter models at NORWIT.PL

Below is a cross-section of the range, from compact electronic units to three-phase converters built for continuous work.

Alongside Enar and Husqvarna Construction, the range also includes Wacker Neuson converters — a set from the same brand is the safest choice for connector compatibility.

Electronic converter vs the older rotary type

Two designs exist on the market: the older rotary type, where a motor mechanically drives a generator producing the higher frequency, and the modern electronic (static) converter, built around a solid-state inverter.

At NORWIT.PL we focus on modern electronic converters — such as the Enar BOXEL series or the Husqvarna CF models — lighter than the older rotary designs, while performing the same job of powering the poker.

Safety when using a frequency converter on the jobsite

Although the 42 V output is safe for the operator holding the poker in wet concrete, the converter itself connects to a 230 V or 400 V mains supply and therefore needs standard jobsite electrical protection. The supply socket should have a residual current device (RCD) with 30 mA sensitivity, and the supply cable must be in good condition, with no chafed insulation.

The converter goes on a stable, dry surface, away from standing water — its housing is built to withstand jobsite conditions but is not designed for immersion. The ventilation openings must stay uncovered, since overheating shortens the inverter's life. After work, disconnect the converter from the mains before unplugging the poker hose.

Frequently asked questions about 42 V / 200 Hz frequency converters

Why buy a 42 V / 200 Hz frequency converter at NORWIT.PL

We specialise in professional concrete compaction: our range includes 42 V / 200 Hz frequency converters primarily from Enar and Wacker Neuson, complemented by Husqvarna Construction models — single-phase 230 V and three-phase 400 V units. We advise on matching a converter to poker diameter and the power supply on site, and recommend a matched 42 V / 200 Hz poker with hose from the same brand to complete the set. The full set is in the 42 V / 200 Hz vibrators category. Orders are fulfilled online.