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WattNode Pulse

WattNode® Pulse – Downloads


Installation Manual

This short installation manual covers all Pulse models and options and is intended for the electrician or electrical installer, as well as anyone doing interface wiring.

  • Install Guide (PDF, 16 pages) – for both WattNode Pulse and WattNode Revenue Pulse

Operation Manual Technical Documents

This operating and reference guide contains additional electrical diagrams, pulse output wiring details, and kWh scale factors.

Manual Supplements

Information Link PDF Download
MS-10 WattNode Pulse – Option PV  (Photovoltaic) MS-10 WNB Pulse Option-PV (PDF, 8 pages)
MS-11 WattNode Pulse – Option DPO  (Dual Positive Outputs) MS-11 WNB Pulse Option DPO (PDF, 2 pages)
MS-17 WattNode Pulse – Option PW  (Pulse Width) MS-17 WNB Pulse Option PW (PDF, 2 pages)
MS-18 WattNode Pulse – Option 2N12  (Two 1Ø  and Sum) MS-18 WNB Pulse Option 2N1 (PDF, 4 pages)
MS-19 WattNode Pulse – Option SSR (Solid-State Relay) MS-19 WNB Pulse Option SSR (PDF, 1 page)
MS-27 WattNode Revenue Pulse MS-27 WNB Pulse Revenue (PDF, 2 pages)

Firmware Updates

The WattNode Pulse production firmware was last revised 2014-05-08 and is very stable. Unless you are experiencing problems, there is generally no reason to update the firmware. The meter must be returned to the factory for firmware updates. There is a nominal charge for factory firmware updates unless they are needed to fix a bug under warranty. See WattNode Pulse Firmware Versions for the full list of versions.


(Only versions from 2009 available)

Support and Application Notes


The WattNode® Pulse meter is a true RMS AC watt-hour transducer with pulse output (solid state relay closure) proportional to kWh consumed or produced. The WattNode Pulse meter provides 0.5% accurate kWh measurements at low cost to meet your needs for sub-metering, net-metering, energy management, and performance contracting applications. The WattNode pulse family measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations. With voltage ratings from 120 to 600 Vac and current transformer (CT) ratings from 5 to 6000 amps, there is a meter and CT combination to measure all types of electrical services.

Diagnostic LEDs

Diagnostic LEDs provide a per-phase indication of line voltage, positive energy (green flashing) and negative energy (red flashing) to help troubleshoot connection problems, like swapped CTs, or excessive line voltage. See the manual for a full description.

Advanced Output Capabilities are available as factory options:

  • Standard meters output positive Wh energy pulses on terminal P1 and negative Wh energy pulses on terminal P2. Terminal P3 is not used in this model. Bidirectional metering is useful with solar systems, where energy consumption from the grid and energy produced by the solar system can be metered separately with one meter (called net metering).
  • For more information on available options see the WattNode Pulse – Options section below

WattNode® Pulse – Key Features and Benefits

WNB P RWNB P Features
Meets the accuracy requirements of the ANSI C12.1 standard for revenue grade applications when used with revenue grade CTs.
  Pulse output: Compatible with energy management systems and data loggers.
Small size: Can be installed in existing service panels or junction boxes.
Bidirectional metering: Net metering for PV (photovoltaic) solar and wind power generation with only one meter.
Advanced metering design: Enables metering of inverters and variable frequency drives.
Line powered: No external supply required.
Detachable terminal blocks: Easy to install and remove.
UL, cUL Listed: Designed and tested for safety and use throughout North America.
CE Mark: Can be installed throughout the EU Community.
Optional kWh Registers are available to remotely displays accumulated kWh readings.
Small form factor for easy installation inside most electrical panels—see an example installation diagram
Safe CT’s (current transformers), output 0.333 Vac at rated current.

  • Split core CTs for quick installation
  • Solid core CTs are less expensive and prevent tampering
  • CTBL large split-core CTs for high currents (standard and custom sizes)
  • CTRC Rogowski Coils for tight spaces where rigid CTs do not fit
Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
Five year warranty

WattNode® Pulse – Specifications

Pulse Output

  • Opto-isolated, 5000 volt rated solid state relay (dry contact rated 60 Vdc at 5 mA)
  • Full-scale bidirectional pulse outputs standard 4.0 pulses per second resolution
  • Optional pulse frequencies, pulse widths, watt-hours per pulse and other output configurations available (see options tab)


WattNode Pulse

  • 0.5% nominal (see manual for details)

WattNode Revenue Pulse

  • 0.5% nominal (see manual for details)
  • Meets accuracy requirements of the ANSI C12.1 standard when used with CCS CTs rated for IEEE C57.13 class 0.6 accuracy (see Revenue Grade CTs).


  • Line powered
  • Operating Voltage Range: –20%, +15% of nominal
  • Power Line Frequency: 50 or 60 Hz
  • CT Input: 0.333 Vac nominal, 3 Vac maximum


  • FCC Class B, EN 55022 Class B
  • UL and cUL Listed (UL 61010-1), file number E312220
  • CE Mark and RoHS Declaration of Conformity
  • Immunity: EN 61326: 2002 (Industrial Locations)


  • Operating Temperature: –30°C to +55°C (–22°F to 131°F)
  • Humidity: 5 to 90% relative humidity (RH) up to 40°C, decreasing linearly to 50% RH at 55°C.


Case Dimensions

(Click on the image for a larger view.)

  • Enclosure:
    • High impact, ABS plastic
    • Flame Resistance Rating: 94V-0, IEC FV-0
    • Size: 6.1 × 3.35 × 1.5 in. (155 × 85 × 38.1 mm)
    • Weight: 10.4 oz (295 g)
  • Connectors: Euroblock style pluggable screw terminal blocks
    • Green: 22 to 12 AWG (0.32 to 2.5  mm2), 600 V
    • Black: 22 to 12 AWG (0.32 to 2.5 mm2), 300 V
    • Screw torque 4.4 lbf·in (0.5 N·m)

WattNode® Pulse – Model Part Numbers

Standard Model Revenue Model Vac Line to Neutral Vac Line to Line Electrical Service Types Neutral Required
120 208-240 Single-Phase 120V with neutral
Single-Phase 3-Wire 120/240V
3-Phase 4-Wire Wye 120/208V
230 400 Single-Phase 230V with neutral
3-Phase 4-Wire Wye 230/400V
277 480 Single-Phase 277V with neutral
3-Phase 4-Wire Wye 277/480V
347 600 Single-Phase 347V with neutral
3-Phase 4-Wire Wye 347/600V
See below 208-240 Single-Phase 208V (No neutral)
Single-Phase 240V (No neutral)
Single-Phase 3-Wire 120/240V
3-Phase 3-Wire Delta 208V–240V (No neutral)
3-Phase 4-Wire Wye 120/208V
See below 400 3-Phase 3-Wire Delta 400V (No neutral)
3-Phase 4-Wire Wye 230/400V
See below 400-480 3-Phase 3-Wire Delta 480V (No neutral)
3-Phase 4-Wire Wye 277/480V
  • Voltage Ranges listed in table are -20% to +15% of nominal. For 3D-240 models, this is -20% of 208 Vac (166 Vac) to +15% of 240 Vac (276 Vac). Operating Frequencies: 50/60 Hz
  • Delta models (3D in part number) work either with or without a neutral connection, but require a line-to-line voltage connection for operating power.
  • Add 10% to the indicated price for any option or valid combination of options. For a list of available options see the Pulse Options tab.

WattNode® Pulse – Options

The WattNode® Pulse and WattNode Revenue Pulse meters are available with several factory options at an additional charge.

See the WattNode Pulse – Model Selector tool. It builds a full model number with options, validates the options, and provides help.

Option P3 – Per-Phase Outputs

(Not available on WattNode Revenue Models)
Option P3 provides three separate pulse output streams, one pulse output channel per measurement phase, which can be used to monitor each phase of a three-phase circuit independently or to monitor three separate single-phase circuits with one WattNode meter.

  • Option P3 is fully documented in the main WattNode Pulse Manual.
  • Example part number: WNB-3Y-208-P Opt P3

Option PV – Photovoltaic

(Not available on WattNode Revenue Models)
Option PV (Photovoltaic) measures net house energy (to or from grid) and PV or wind generated energy with a single WattNode meter.

Option Hz – Custom Pulse Frequency

Option Hz replaces the standard 4.00 Hz full-scale output pulse rate with a different rate.

  • Frequency range (Standard Bidirectional Outputs): 0.01 Hz to 600 Hz
  • Frequency range (Option DPO, Option P3, Option PV): 0.01 Hz to 150 Hz
  • Example part number: WNB-3Y-208-P Opt Hz=300
  • Example part number: WNB-3Y-208-P Opt P3,Hz=10/20/150

Option DPO – Dual Positive Outputs

Option DPO (Dual Positive Outputs) adds an extra pulse output channel for positive real energy. This allows the WattNode meter to be easily connected to two different devices, such as a display and a data logger.

Option SSR – Solid State Relays

Option SSR (Solid State Relays) replaces the standard optoisolators with solid state relays.

Option PW – Pulse Width

Option PW allows a fixed output pulse width, useful when driving certain devices like electro-mechanical displays.

  • Example part number: WNB-3Y-208-P Opt PW=100. This would result in pulses with 100ms width (conducting or closed).
  • Manual Supplement 17 (PDF)

Option Kh – Watt-Hours Per Pulse

Option Kh combined with Option CT configures the meter for a certain “watt-hours per pulse” value.

  • Example part number: WNB-3Y-208-P Opt Kh=100,CT=50. This would result in one pulse per 100 watt-hours or one pulse per 0.1 kWh.

Option CT – CT Rated Amps

Option CT (used with Option Kh) configures the current transformer rated amps. This is necessary with Option Kh.

Option 2N1 – Two Single-Phase Outputs And One Sum of Phases Output

(Not available on WattNode Revenue Models)
With Option 2N1, one model of WattNode Pulse meter can be used for monitoring either two single-phase circuits or one multi-phase circuit, simplifying ordering, stocking, and installation.


Pulse Totalizer Display

Simple counter for WattNode Pulse meters
Ideal for low-cost tenant metering!
Accumulates kWh pulses up to 99,999,999 kWh
Battery rated for 15+ years

Purchase the Pulse Totalizer Display here