RAIL 350


  • Din rail mounted (6 modules width)
  • Suitable for 3 phase loads 3 wire or 4 wire
  • Suitable for single phase loads
  • TRMS measurement to 30th Harmonic
  • Isolated dual pulse outputs as standard
  • Optional MODBUS RS485 output
  • Optional IP Ethernet enabled, with built in Web pages
  • Current input via CT’s 5 Amp, 1 Amp or 333mV
  • Class 1 accuracy
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The RAIL 350 is a Din rail mounted (6 module width) multi display energy meter suitable for both three phase and single phase loads and if three phase both 3 wire or 4 wire balanced or unbalanced loads, inductive or resistive. The RAIL 350 is fully programmable to set up CT ratios, the CT secondary can be specified at ordering as either conventional 5 Amp or 1 Amp, or as 333mVAC which are used in application scenarios where the CT’s are sited a distance away from the meter and VA burden within the secondary cabling is an issue. The RAIL 350 auto scales to Wh, KWh, MWh etc, depending on the CT ratio programmed. The RAIL 350 is able to accept a very wide voltage input span of 80-480V L-L or 46-277V L-N, thus enabling the RAIL 350 to be used on VT circuits such as 11KV/110V, therefore a VT ratio can also be programmed if required.

Please note, the optional Voltage Expander module as detailed for the CUBE 350 and CUBE 400 cannot be used with the RAIL 350

Pulse Outputs - All RAIL 350’s have dual isolated volt free pulse outputs as standard for KWh & KVArh for interfacing to external equipment such as BMS systems.

MODBUS Communications - The RAIL 350 can also be specified optionally with MODBUS RS485 whilst still retaining the pulse outputs. Via the MODBUS communications comes Harmonics information, individual to the 15th and THD to the 30th.

IP Ethernet Option – With built in Web pages showing parameters of; Energy, Power, Volts, Amps, Power Factor and digital input/s and output/s set-up, with total logging of up to 60 parameters. Set up logging for TCP/IP protocols FTP / HTTP / TFTP / SNMP for directly interfacing with energy management software and building control solutions. Additionally RAIL 350’s with the IP Ethernet option comes with three scalable digital pulse inputs from say other utility meters, such as gas and water etc, which can also be read via the Web pages. Two digital alarm outputs are also provided along with the standard pulse outputs that all RAIL 350’s have. Harmonics, individual to the 15th and THD to the 30th is a standard on IP Ethernet meters.


1 phase
3 phase, 3 wire or 4 wire balanced or unbalanced

Voltage: 80-480V L-L / 46-277V L-N +0%

Via external CT’s
5 Amp, 1 Amp, 333mV
Measuring range 0.2% to 120%

Frequency: 45-65Hz

THD to 30th (with Harmonics option)
Individual to 15th (with Harmonics option)

Voltage burden: < 0.1VA per phase

Current burden: < 0.1VA per phase

Voltage overload: x4 for 1 hour

Current overload: x40 for 0.5 Sec max

Auxiliary supply:
230VAC 50/60Hz + 15%
On request 110VAC
On request 24VDC

5VA max
5W max


Temperature: Operating -10 ̊C to +55 ̊C

Humidity: <75% non condensing

Material: Noryl to UL94-V-0, self ext.

Terminals: 4mm rising cage

106 x 90 x 58mm
(Din rail modular, 6 modules width)


Class 1 per EN 62053-21
Class 0.5 per ANSI C12.20

KVArh: Class 2 per EN 62053-23

KW & KVA: Class 0.25 IEC 60688

KVAr: Class 0.5 IEC 60688

Amps & Volts: Class 0.1 IEC 60688

Power Factor: ± 0.2 ̊

Neutral current: Class 0.5 IEC 60688

Pulse outputs:
1 pulse for KWh
1 pulse for KVArh

Scaling: Programmable between 1 & 100 counts of registers

Pulse periods: Programmable between 0.1-20Sec

Type: 2 x NO volt free, optically isolated

Rating: 100mA @ 70VDC/33VAC max

Isolation: 3.5KV for 1 min

IP ethernet option:
Digital inputs: 3
Digital outputs: 2


RAIL 350
RAIL 350 / IP


230VAC aux supply (standard)
110VAC aux supply
24VDC aux supply


5 Amp
1 Amp

**Please see split core 333mVAC secondary CT’s types: SCL, SCT, ROPE



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