Power Supplies & Relays

The Davis Derby Minewatch PS21 range high capacity intrinsically safe 12V dc power supplies and relay units provide simple robust solutions for the supply of intrinsically safe controllers and sensors.

The Minewatch PS21 range of power supplies / relays is available in 8 versions:

MineWATCH PS21

Flameproof / intrinsically safe (12Vdc @ 500Ma) power supply with 120/240Vac input (other input voltages available).

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MineWATCH PS21-R

As Minewatch PS21 but including 6, intrinsically safe to flameproof, interposing relays for the control of mining flameproof switchgear.

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MineWATCH PS21-B

As Minewatch PS21 but including an 8Ah battery pack to create an uninterruptible power supply unit.

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PS21 Power Supply Relay Units

The Davis Derby Minewatch PS21 range high capacity intrinsically safe 12V dc power supplies provide simple robust solutions for the supply of intrinsically safe controllers and sensors.

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MineWATCH PS21-D

Flameproof/ Dual Intrinsically Safe (2x12Vdc @ 500mA each) Power Supply with 120/240v ac input (other input voltages available).

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MineWATCH PS21-RD

As per MINEWATCH PS21-D but including 6 Intrinsically Safe to Flameproof Interposing Relays for the control of mining flameproof switchgear.

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MineWATCH PS21-BD

As per MineWatch PS21-D but including an 8A/Hr battery packs to create an uninterruptible Power Supply Unit.

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MineWATCH PS21 BD/B

As MINEWATCH PS21-D but including an 8A/Hr battery pack to create an Uninterruptible Power Supply Unit with the addition of analogue output monitoring capabilities of the battery unit.

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MineWATCH PS21-Int/R

This has the same Flameproof enclosure as the MINEWATCH PS21-RD but has no Power Supply chassis and contains 2, 4or 6 Intrinsically Safe to Flameproof Interface Relays.

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