DTS 310


DIN rail Mount / Line Powered

  • Compact – 4.73” L x 1.38” W x 4.25” H
  • ANSI C12.20 – Revenue Grade
  • ETL Listed, CE, BTL Listed, SunSpec certified
  • 208V – 480V ac, L-L (1P 2W, 1P 3W, 3P 4W)
  • 600V ac, L-L, 3 or 4 W (option)
  • Ethernet, RS-485 or Pulse (kWh) connectivity
  • Modbus TCP, BACnet/IP, SNMP or DNP 3.0
  • Modbus RTU, BACnet MS/TP or LonWorks
  • 333mV, 5A or Rope CT inputs
  • Bi-directional for renewable systems (NET metering)
  • Options include: Digital Input/Outputs, Auxiliary, DTS Logging System
  • Specifications above are model dependent.

Product Description

One of the most versatile and accurate meters on the market. The DTS 310 has a very compact DIN rail design, requires no external power source to operate, and comes with color coded, pluggable connectivity. This meter is certified to ANSI C12.20 Class 0.2 (Revenue Grade) providing the most accurate data acquisition available. It can function in either a single, split or three phase environment and is equipped with auto-topology detection. The DTS 310 works with all “safe” 333mV or 5A current transformers (CTs) and comes with CT Reverse Algorithms for automatic correction of in-proper field mounted CTs.

For easy configuration in-the-field, communications can be set via DIP switches when utilizing the Modbus RTU protocol. Or for remote configurability, all the DTS Series of meters are offered with our free DTS Config software platform; where you can conveniently choose from over 200 parameters at the frequency you require. It also has a User-definable Modbus register area.

The DTS 310 is available with optional digital status/counter inputs or digital outputs, which can be used to import gas or water meters or to control any third party device; and is offered with optional on-board logging with our DTS Logging System. Also, if in the future, you decide to integrate renewable energy sources, the DTS 310 will conveniently operate as a Bi-directional NET meter. The DTS 310 is SunSpec Alliance certified and easily integrates with Building Automation Systems and Energy Monitoring Software. All our DTS Series of meters are designed and manufactured in the USA and comply with the Buy American Provisions of ARRA Section 1605.



  • Line powered single / three phase energy submeter with auto-topology detection
  • Class 0.2 Energy Meter** (ANSI C12.20) – “Revenue grade”
  • Bi-directional for renewable systems (NET metering)
  • Interfaces with “safe” mV, 5A or RopeCTs
  • Embedded Ethernet connectivity – Modbus/TCP, BACnet/IP, SNMP or DNP 3.0
  • RS-485 connectivity – Modbus RTU or BACnet MS/TP
  • Communications setting via DIP switches for Modbus RTU
  • LonWorks FT-10 communications
  • 2 digital status/counter inputs OR digital outputs – optional
  • Color coded, pluggable connectivity
  • Compact DIN rail design
  • User configurable using DTS Config software
  • User-definable Modbus register area
  • Compatible with most energy management and control software suites
  • BLT & ETL listed
  • SunSpec Alliance certified
  • Designed and Manufactured in the USA. Complies with Buy American Provisions of ARRA Section 1605

** CTs excluded


Measuring Circuits

Voltage range: 208V – 480V ac, L-L (1P 2W, 1P 3W, 3P 4W), 600V ac, L-L, 3 or 4 W (option)
Voltage overload: 1.2 x (1.1 x with 600V option)
Voltage burden: <0.1 VA @ 280 V ac L-N
Frequency: 45 to 65 Hz
Rated current: 333 mV or model dependent
Current overload: 1.2 x
Power overload: 1.2 x


Voltage: 0.5%, <0.2% typical (80-120%)
Current: 0.5%, <0.2% typical (10-120%)
Power: 0.5%, <0.2% typical (10-120%)
Power Factor: 0.5% (between 0.5 and 1.0)
Energy:** Class 0.2 (ANSI C12.20)

Voltage Supply

Voltage: Powered from Phase A & B or Phase A & Neutral (model dependent)
Frequency: 50/60 Hz
Burden: <3VA
DC Auxiliary Option
Voltage options: 12Vdc, 24Vdc or 48Vdc
Tolerance: -25%, + 50%
Burden: <3VA
Isolation: 1500Vd


Connection: Pluggable screw terminals suitable for 12AWG stranded wire (2.5mm2)
Case Material: Self-extinguishable, V0 plastic
Protection: Nema 1 (IP40)
Dimensions: 4.73”(120mm) D x 4.25”(108mm) H x 1.38”(35mm) W
Weight: 1lb (0.45 kg)


Operating temp: -4º to 131ºF (-20º to 55ºC)
Storage temp: -40º to 185ºF (-40º to 85ºC)
Humidity: 5 to 95% R.H. non-condensing

Communications (Serial)

Connection: 3 way pluggable, screw terminal
Protocols: Modbus RTU (SunSpec Certified) or BACnet MS/TP

Communications (LonWorks)

Connection: 2 way pluggable, screw terminal
Protocols: LonWorks FT-10

Communications (Ethernet)

Connection: RJ45, 10/100Base-T
Protocols: Modbus TCP (SunSpec Certified), BACNet/IP, SNMP or DNP 3.0 over IP

Pulse / Status Outputs (Optional)

Type: Potential Free, N.O. Solid State Relay
Pulse Width: Max 10 Pulses per Second
Pulse Rate:
Max On-Resistance: 30 ohm
Max switching voltage: 240Vac
Max switching current: 120mA (350mA for 10mS)


Counter / Status Inputs: – Optional
Type: Dry Contact
Min Pulse Width: 50mS, Max 10 Pulses per Second
Max Current/Voltage: 15mA / 6V
Connection: 2 Pin-Pairs (Inputs 1 and/or 2)

Standards & Safety

ETL listing: 4001073
Conforms to: UL Std 61010.1
Certified to: CSA Std C22.2 # 61010.1
FCC: CISPR 22/FCC 15 class A
Category III – 280Vac / 485Vac

Data Sheets & Downloads


DTS 310 Brochure (1.9 Mb) [PDF]
Right Angle Bracket Datasheet (1.3 Mb) [PDF]
Inline Fuse Kit Sheet (1 Mb) [PDF]


DTS 310 – Installation Guide (3 Mb) [PDF]


Download DTS Config — Current Version (1.5 Mb) [ZIP]
Download DTS Toolbox — Current Version 1.01aA (9.2 Mb) [ZIP]

DTS Modbus Map (456.4 Kb) [PDF]
DTS Modbus Addendum (SunSpec) (215.4 Kb) [PDF]
DTS BACnet MS/TP Map (369 Kb) [PDF]
DTS BACnet/IP Map (182.2 Kb) [PDF]
DTS LonWorks Map (150 Kb) [PDF]
DTS SNMP Map (146.1 Kb) [PDF]
DTS DNP 3.0 Map (157.1 Kb) [PDF]

DTS Logging System (308 Kb) [PDF]
Configuring digital outputs (700.4 Kb) [PDF]

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