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HOSPAOP

Converters and DC protection

A converter and the breaker that protects a solar string, from one supplier.

Why direct current needs its own breaker

Alternating current crosses zero a hundred times a second, and an arc drawn on opening extinguishes itself at one of those crossings. Direct current never does.

A DC breaker is built to stretch and quench that arc mechanically. An alternating-current breaker at the same amperage is not a substitute, whatever the label says.

What the breaker listing publishes

20 A, 500 V DC, two poles, 35 mm DIN rail, and a red and green status indicator.

The indicator is the useful part. A handle position tells you what the breaker was set to; the window tells you what it did — and a breaker that tripped an hour ago looks identical to one somebody switched off.

Breaking capacity, trip curve, polarity

A breaking capacity, which is the fault current it can interrupt and survive. And a trip curve, which decides whether an inverter can start behind it without tripping it.

And polarity

On a DC breaker the direction of current decides how the arc is blown into the chute. Neither DC breaker in this catalogue marks it.

HOSPAOP in this catalogue

  • 12 V to 230 V converters

    HOSPAOP 1000 W continuous, 2000 W peak, 12 V or 24 V

    1000 W continuous, 2000 W peak · modified sine · input current not published · cable not specified · fusing not published · direct battery connection · no remote · eight protections including reverse polarity

    A converter accepting 12 V or 24 V and delivering 1000 W continuously with a 2000 W peak, with eight protections including reverse polarity and a voltage-monitoring LCD.

    Best for: A van with a 24 V system where reverse polarity protection is wanted on a clamp connection.

    ≈ €57

    Check price on Amazon Read the review

Everything HOSPAOP puts on these shelves

  • HOSPAOP two-pole DC isolator with a status indicator

    HOSPAOP Pair of 20 A two-pole DC breakers, 500 V, red/green indicator

    Two 20 A two-pole DC circuit breakers rated 500 V for photovoltaic systems, with a red and green status indicator and 35 mm DIN rail mounting.

    Rated current
    20 A, from the title
    DC voltage rating
    500 V, from the title
    Breaking capacity
    Nowhere in the listing
    Polarity
    Nowhere in the listing
    Poles
    Two, from the title
    Trip curve
    Nowhere in the listing
    Mounting
    35 mm DIN rail, described as quick and stable, second bullet; a red and green indicator shows the state at a glance, third bullet
    Amazon reference
    B0DYTX32SG (same reference on 6 Amazon marketplaces)
    EAN
    0788754332621
    • A visual status indicator, green for closed, which no other breaker here has
    • A C-shaped ergonomic handle described for operating it under load
    • No breaking capacity, the figure the other breaker in this family publishes

    Best for: A 20 A array where the isolator state should be readable from across the room.

    ≈ €15
    Check price on Amazon

A price quoted in the text of a PowerVerdict page dates from the day that page was written; the live figure beside each product is fetched while you read and replaces it.