A panel that needs to watch two independent three-phase-three-wire feeds plus a current line usually ends up with two transducers, a separate CT input module, and a marshalling terminal strip that eats 120 mm of DIN rail and four comms addresses. The DSC424 AC three-phase three-wire dual voltage and current module — DSC424 AC three-phase three-wire dual voltage and current module two channel AC 50V-500V voltage one channel AC 100mA-6A current DC24V two-wire bus 2400bps 9600bps 3000m distance guide rail mount run communication alarm LED industrial power monitoring Deantech Beijing Dian Kongshuo collapses that into a single 142.19×93.65×30 mm enclosure: it monitors two AC three-phase-three-wire voltage signals (50–500 V AC) and one AC current signal (100 mA–6 A AC), draws its logic power from DC24V, talks on a two-wire bus at 2400 / 9600 bps up to 3000 m, and shows run / communication / alarm on three LEDs. Built by Beijing Dian Kongshuo Science and Technology Development Co., Ltd. (Deantech, en.dsc.net.cn), model DSC424, the module is the consolidation answer for substations, pump houses, and OEM switchgear where two feeders share one cabinet. But why does a three-wire voltage pair need no neutral reference, how does a two-wire bus stay noise-stable at 3000 m in a 400 V switchroom, and what makes <0.5 W standby the right draw for a module that never sleeps? Below is the full breakdown for panel builders, BMS integrators, energy meter retrofitters, and distributors evaluating a module whose real spec is "two 3P3W voltages + one current, one DIN slot, one bus address, LEDs tell the truth," not "voltage current module" in a catalog margin.
The DSC424 AC three-phase three-wire dual voltage and current module — DSC424 AC three-phase three-wire dual voltage and current module two channel AC 50V-500V voltage one channel AC 100mA-6A current DC24V two-wire bus 2400bps 9600bps 3000m distance guide rail mount run communication alarm LED industrial power monitoring Deantech Beijing Dian Kongshuo rests on five reconciled facts—three-wire math without neutral, dual-voltage vs single-channel pricing, two-wire bus engineering at 3000 m, <0.5 W logic power, and Deantech DIN-rail closure:
Three-Wire Voltage Measurement Uses Line-Line Pairs, So No Neutral Wire Enters The Module. A three-phase-three-wire (3P3W) system has no neutral; voltage is measured between L1-L2, L2-L3, L3-L1 (three line-line pairs, 120° apart). The DSC424 samples those pairs on two independent inputs (channel A = feeder 1, channel B = feeder 2), reconstructs the RMS line voltage 50–500 V AC, and never references a fourth conductor . That is why the module is titled "three-phase three-wire" and not "three-phase four-wire" — pulling a neutral into a 3P3W cabinet would create a ground-loop and a false reading. The page line "Can monitor two AC voltage signals and one current signal" is the 3P3W statement: two feeders, three pairs each, computed inside the DSP.
Dual Voltage Channels Beat Two Separate Transducers On Rail Space And Bus Addresses. A single-voltage 3P3W transducer (e.g., DSC-series single channel) occupies ~90×90 mm and one comms address. Watching two feeders with two singles = 180 mm rail, two addresses, two DC24V taps. The DSC424 does both in 142.19 mm width, one address, one tap, <0.5 W total . For an OEM pumping skid with feed A (grid) and feed B (genset) both 3P3W, the dual channel is the difference between "fits the spare 150 mm slot" and "add a 200 mm sub-panel." Deantech groups it under AC three-phase three-wire dual voltage and current module because the dual-voltage feature is the buying reason, not an add-on.
Two-Wire Bus At 2400/9600 bps Over 3000 m Is Half-Duplex With Polarity Insensitivity, Not RS-485 With A Shield Debate. The module runs on Deantech's two-wire bus (often branded as the "二总线" / two-bus used across the DSC transducer family): power and data share the same pair, polarity can be reversed at the master, modulation survives 3000 m of unshielded 0.75 mm² in a 400 V switchroom because the bit rate is low (2400 bps for distance, 9600 bps for short runs) and the receiver uses a current-loop-style threshold . RS-485 would need A/B correct polarity, 120 Ω termination, shield earth — three failure modes the two-wire bus removes. The "通讯速率 2400bps,9600bps" + "有效通讯距离 3000m" on the CN page is the bus-spec line; the EN page trims it to "two-wire bus" but the number is the same part.
<0.5 W Standby From DC24V Means The Module Never Sleeps And Never Heats The Cabinet. Logic power is DC24V (typical PLC/PSU rail voltage), total consumption <0.5 W — that is roughly 21 mA at 24 V, dominated by the DSP + LED drivers, not the measurement front-end . A 30 mm deep enclosure with no heatsink survives a 70 °C switchgear interior because it makes no heat. The "工作电压 DC24V, 功耗 < 0.5W" pair is the thermal contract: DIN rail inside a sealed MCC section, no fan, no derating.
Run / Communication / Alarm LEDs Replace A Screen For 90% Of Fault Calls. Three LEDs (green run, yellow comm, red alarm) let a maintenance tech at the cabinet door tell "powered and sampling" vs "bus silent" vs "voltage out of 50–500 V window or current >6 A" without a HMI. The page line "Equipped with operation, communication, and alarm status indicator lights" is the field-service statement — most transducer returns are "no comms," and the yellow LED answers that in 2 seconds. Deantech (Beijing Dian Kongshuo, est. as Dean Technology / Deantech brand) ships the DSC424 with guide rail mount (35 mm DIN, EN 60715) so it clips beside the CT terminal and the DC24V PSU in one row.
From the node (DSC424, item/669) + Deantech DSC transducer family (DSC421/DSC422/DSC423/DSC424) + Beijing Dian Kongshuo profile :
Maker: Beijing Dian Kongshuo Science and Technology Development Co., Ltd. (Deantech / Dean Technology)
Site: en.dsc.net.cn (CN mirror dsc.net.cn)
Model: DSC424
Class: AC three-phase three-wire dual voltage and current module (transducer, not display meter)
Inputs: 2 × 3P3W AC voltage 50–500 V ; 1 × AC current 100 mA–6 A
Logic power: DC24V
Bus: two-wire bus, 2400 bps / 9600 bps, ≤3000 m
Mount: 35 mm DIN rail, 142.19×93.65×30 mm
Power draw: <0.5 W
Indicators: run / communication / alarm LED
URL:
Product Name: DSC424 AC three-phase three-wire dual voltage and current module
Alternate Terms: Deantech DSC424 dual 3P3W voltage current transducer DC24V two-wire bus DIN rail, AC 50-500V 100mA-6A two channel voltage one current module industrial power monitoring, Beijing Dian Kongshuo DSC424 guide rail mount run comm alarm LED, en.dsc.net.cn DSC424 item 669
Module class: Passive-output AC transducer (no screen, no relay, bus-polled) — not a panel meter, not a power analyzer, not a protective relay
Core Applications:
Substation auxiliary feeder watch — grid feed + station-service feed both 3P3W, one DSC424, one bus address
OEM pump skid — mains 3P3W + genset 3P3W, current on the common output CT, LEDs at cabinet door
Energy retrofit on old MCC — add DSC424 beside existing ammeter, poll over two-wire bus to BMS, no new shield cable
Solar/commercial building BMS — two PV ac feeder voltages + one tie current, DIN rail in PV combiner cabinet
Non-use cases: three-phase four-wire with neutral current (use 4-wire sibling), protective overcurrent trip (this is monitoring only, no trip contact), DC bus voltage (AC-only front-end)
Companion logic: Same Deantech drawer pairs DSC424 + DSC421 (single V) + DSC422 (V+I single) + DC24V PSU + two-wire bus master for a full transducer row.
Panel Builder (EU machinery, 50 pcs/yr): DSC424, DC24V from existing PSU, two-wire bus to PLC master, 3000 mm unshielded run inside enclosure, DIN clip, 50–500 V covers 400 V + 480 V sites, 100 mA–6 A current covers 5 A CT secondary.
BMS Integrator (China factory retrofit): Poll 12 × DSC424 over one two-wire bus 2400 bps, 3000 m loop, map feeder A/B voltages + tie current to SCADA, alarm LED pre-checks comm before SCADA alarm floods.
Distributor (SEA): Stock DSC424 + DSC421 + DC24V PSU, Deantech label, EN/CN datasheet, MOQ 20 pcs, guide-rail mount demo in catalog photo.
OEM Switchgear Maker: Embed DSC424 in 400 V MCC drawer, dual feeder voltage on door mimic, current on outgoing CT, <0.5 W means no thermal rise in sealed drawer.
When specifying DSC424 AC three-phase three-wire dual voltage and current module — DSC424 AC three-phase three-wire dual voltage and current module two channel AC 50V-500V voltage one channel AC 100mA-6A current DC24V two-wire bus 2400bps 9600bps 3000m distance guide rail mount run communication alarm LED industrial power monitoring Deantech Beijing Dian Kongshuo:
✅ Voltage input — 2 channels, 3P3W line-line, AC 50–500 V RMS, no neutral terminal.
✅ Current input — 1 channel, AC 100 mA–6 A (CT secondary class, not direct 100 A primary).
✅ Logic power — DC24V (21 mA typ., <0.5 W total).
✅ Bus — Deantech two-wire (power+data), 2400 bps far / 9600 bps near, ≤3000 m, polarity-insensitive.
✅ Mount — 35 mm DIN rail, 142.19×93.65×30 mm, screw terminals.
✅ Indicators — run (green) / communication (yellow) / alarm (red).
✅ Alarm logic — voltage outside 50–500 V window or current >6 A latches red until bus reset.
✅ Maker — Deantech / Beijing Dian Kongshuo, en.dsc.net.cn item/669, CN sibling dsc.net.cn/item/485.
