TRIPP-LITE PDUMH15HVAT Metered Rack-Mount PDU with Automatic Transfer Switch Owner’s Manual

Important Safety Instructions


  • This manual contains instructions and warnings that should be followed during the installation, operation and storage of this product. Failure to heed these instructions and warnings may affect the product warranty.
  • Warning: This equipment is compliant with Class A of CISPR 32. In a residential environment, this equipment may cause radio interference
  • The PDU provides the convenience of multiple outlets, but DOES NOT provide surge or line noise protection for connected equipment.
  • The PDU is designed for indoor use only, in a controlled environment, away from excess moisture, temperature extremes, conductive contaminants, dust or direct sunlight.
  • Keep indoor ambient temperature between 0°C and 50°C (32°F and 122°F).
  • The PDU must be installed by a qualified technician only.
  • Do not attempt to mount the PDU to an insecure or unstable surface.
  • Install in accordance with National Electrical Code standards ANSI/NFPA 70 and Canadian Electrical Code, Part I, C22.1. Be sure to use the proper overcurrent protection for the installation, in accordance with the plug/equipment rating.
  • Connect the PDU to an outlet that is in accordance with your local building codes and that is adequately protected against excess currents, short circuits and earth faults.
  • The electrical outlets supplying power to the equipment should be installed near the equipment and easily accessible.
  • Do not connect the PDU to an ungrounded outlet or to extension cords or adapters that eliminate the connection to ground.
  • Be sure to provide a local disconnect device on any models that are permanently installed without a plug that is easily accessible.
  • Never attempt to install electrical equipment during a thunderstorm.
  • Individual equipment connected to the PDU should not draw more current than the individual PDU’s outlet’s rating.
  • The total load connected to the PDU must not exceed the maximum load rating for the PDU.
  • Do not attempt to modify the PDU, input plugs or power cables.
  • Do not drill into or attempt to open any part of the PDU housing. There are no user-serviceable parts inside.
  • Do not attempt to use the PDU if any part of it becomes damaged.
  • Use of this equipment in life support applications where failure of this equipment can reasonably be expected to cause the failure of the life support equipment or to significantly affect its safety or effectiveness is not recommended.
  • The AC Mains tolerance of this equipment is +6/-10%
  • Short-circuit backup protection and over current protection is provided by the building installation.
  • To reduce the risk of fire, connect only to a circuit provided branch circuit over current protection in accordance with the National Electrical Code, ANSI/NFPA 70 and the Canadian Electrical Code, Part I, C22.1. Be sure to use maximum 20A over current protection in accordance with the plug/equipment rating, for the installation.
  • The plugs on the power supply cords and appliance inlet serve as the disconnect devices. Make sure the socket-outlets providing power to the PDU are easily accessible.
  • This equipment is not suitable for use in locations where children are likely to be present.
  • Only those who are properly trained or qualified to use this device should do so. Anyone who is not trained or qualified should not use this device unless it is under the supervision of someone who is properly trained or qualified to do so.
  • Children must be supervised to ensure that they do not use the device as a toy.
  • Never use the device if the cord and plug are damaged. If the device is not working properly or if it has been dropped or damaged, take it to an authorized service center for inspection and repair.
  • If the power cord is damaged, it must be replaced by the manufacturer, its authorized service agent or qualified personnel in order to avoid danger.


Mounting the PDU

The PDU supports 1U Rack configurations.

Note: The user must determine the fitness of hardware and procedures before mounting. The PDU and included hardware are designed for common rack and rack enclosure types and may not be appropriate for all applications. Exact mounting configurations may vary.

1U Rack Mounting: Attach the PDU to the rack by inserting four user-supplied screws A through the PDU mounting brackets B and into the mounting holes of the rack rail as shown.
Mounting the PDU

Connecting the PDU

All PDU models include a primary and secondary AC power input (see diagram). The reference table below lists each model’s primary and secondary inputs:


Primary Input

Secondary Input

PDUMH15HVAT* IEC C14 inlet (detachable cord) IEC C14 inlet
PDUMH15HVATNET* IEC C14 inlet (detachable cord) IEC C14 inlet
PDUMH20HVAT1* IEC C20 inlet (detachable cord) IEC C20 inlet
PDUMH20HVATS* IEC C20 inlet (detachable cord) IEC C20 inlet
PDUMNH20HVAT1* IEC C20 inlet (detachable cord) IEC C20 inlet
PDUMN20HVAT* IEC C20 inlet (detachable cord) IEC C20 inlet
PDUMH20HVATNET* IEC C20 inlet (detachable cord) IEC C20 inlet

*PDU includes one C13 to C14 (PDUMH15HVAT/NET) or two  C19to C20 (PDUMH20HVAT, PDUMH20HVAT1, PDUMH20HVATS, PDUMNH20HVAT1, PDUMH20HVATNET) interconnection cables for the two primary and secondary inlets, which may be used to connect to upstream UPS sources. Alternately, the user can supply IEC cables fitted with country-specific plugs.
Connecting the PDU
Primary Input (208-240V Models)


Feature Set Overviews

Part Description Outlet Types Outlet Control Outlet LED Indicator Shipped with SNMP Slot Shipped with SNMP Card Installed

2.2.1 Connect Secondary Input Cord to PDU:

Although the PDU will operate without connecting the Secondary input cord, the Secondary input is required for the PDU’s Automatic Transfer Switch function.
Connect Secondary

2.2.2 Connect PDU Input Plugs:

(See the Configuration and Operation section for more information.) Connect the Primary input plug A to a preferred source of grounded 230V AC power, such as a SmartOnline® UPS System. The UPS system must not share a circuit with a heavy electrical load (such as an air conditioner or refrigerator). Under normal operating conditions, the PDU will distribute AC power from the Primary input source. Connect the Secondary input plug B to an alternative source of grounded 230V AC power, such as a redundant SmartOnline UPS System. Do not plug the Secondary input into the same power source as the Primary input. The PDU will distribute AC power from the Secondary input only if the Primary input becomes unavailable.

Note: Immediately after the PDU is connected to live AC power, you may notice a series of soft clicking sounds emitted by electrical relays within the PDU. The relays may also click occasionally during the operation of the PDU. This is normal.

2.2.3 Selecting Input Voltage Range:

These models have two selectable nominal input voltage ranges: 200V 208V (“LO”) and 220V-240V (“HI”). Press the button next to the display to toggle the nominal voltage setting to the desired “HI” or “LO” range. This setting adjusts the voltage ranges for the primary and secondary inputs. The display will indicate “HI” or “LO” for five seconds.

2.2.4 Connect Equipment to PDU:

Do not exceed the load rating of the PDU. The total electrical current used by the PDU will be displayed on the digital meter in amperes. Each outlet includes a green LED that illuminates when the outlet is receiving AC power. (Select models only. See Feature Set Overviews chart above for model-specific configurations.)

Networking the PDU (Models with SNMP Card Installed only)

For network configuration instructions, please refer to the WEBCARDLX Owner’s Manual included with this product.



*Models with SNMP card installed only.

  1. Primary Input
    Models PDUMH15HVAT/NET: The C13-C14 cord is detachable.
    PDUMH20HVATNET: The C19-C20 cord is detachable.
    2 Secondary Input Inlet (detachable on all models)
    Models PDUMH15HVAT/NET: The IEC-320-C14 inlet connects to the detachable Secondary AC Input Power Cord. Models PDUMH20HVAT, PDUMH20HVAT1, PDUMH20HVATS, PDUMNH20HVAT1, PDUMH20HVATNET: The IEC-320-C20 inlet connects to the detachable Secondary AC Input Power Cord.
  2. Switched Outlets: During normal operation, the outlets distribute AC power to connected equipment. These outlets may be switched On and Off via software control. When an outlet is live, the associated LED illuminates.
  3. Unswitched Outlets: These outlets receive power from either input source, but are not individually switchable.
  4. Factory Configuration Port: The port is reserved for configuration by factory authorized personnel only. No user information is available. Connecting to this port may render the unit inoperable and void its warranty.
  5. Digital Load Meter (Ammeter): The total electrical current used by the connected equipment is displayed on the digital meter in amperes.
    Input Voltage Range Select Switch: The button to the lower left of the display may be used to toggle between “HI” or “LO” voltage ranges. The display will indicate “HI” or “LO” for five seconds. Press the switch once to display ranges. Press again within five seconds to change setting. Setting can also be changed via PowerAlert (PDUMH15HVATNET and PDUMH20HVATNET only). IP Address Display (Models with SNMP card installed only): Press and hold the switch to display the IP address of the SNMP card in the PDU.
  6. Network Interface (Models with SNMP card installed only): Allows you to operate the PDU as a managed network device, accessible via SNMP network management platform, web browser, SSH or Telnet.
  7. Input Source Indicator: When the PDU is connected to a live AC power source, the Primary or Secondary input LED illuminates to indicate which source is supplying power to the outlets.
  • Primary and Secondary AC Input Power Cord
    (Models PDUMH20HVAT, PDUMH20HVAT1, PDUMH20HVATNET, PDUMH20HVATS, PDUMNH20HVAT1): Two C19-C20 cables are included: one for Primary Input and one for Secondary Input.
  • Primary AC Input Power Cord (Models PDUMH15HVAT, PDUMH15HVATNET): A C13-C14 cable is included.
  • Plug Lock Inserts: Prevent accidental disconnection of C13-C14 or C19-C20 power cords.

Configuration and Operation

Automatic Transfer Switch

When the Primary and Secondary inputs are both connected to Tripp Lite UPS Systems, the PDU operates as an Automatic Transfer Switch, providing redundant input power for high availability applications. Under normal operating conditions, the PDU will distribute power from the Primary input source, switching to the Secondary input source under certain conditions. The PDU will switch to the Primary source whenever it is “Good” according to the PDU input voltage definitions (see section 4.1.2 for more information).

4.1.1 Preferred Configuration

The Automatic Transfer Switch function provides increased availability when the Primary and Secondary inputs of the PDU are connected to separate Tripp Lite UPS Systems that are connected to separate utility power sources. For maximum availability, Tripp Lite recommends using matching SmartOnline UPS Systems with pure sine wave output for the Primary and Secondary input power sources. The automatic transfer switch function will be compromised if the primary and secondary inputs are connected to the same utility power source.

Warning: DO NOT connect the primary input to a line-interactive  UPS, due to transfer time issues, or to any source that does not supply a pure sine wave. Such sources may be used to power the secondary input.
Automatic Transfer Switch

4.1.2 Automatic Transfer Switch Source Selection

The PDU will power up if one of the input sources is greater than the minimum startup voltage. In normal operation (after power-up), if the presently selected source (primary or secondary) degrades to a lesser condition, the unit should switch to the alternate source, if that source is of better quality. The unit prefers the primary source, and will always switch to it in the event that both sources are of the same (fair or good) quality. If the present source is becoming bad and the alternate source is at least fair, the unit will switch to the alternate source.

Nominal Voltage of PDU

High-Voltage Models
200-208V 220-240V
Minimum Startup Voltage 163V 163V
Good Voltage Range 172-241V 190-266V
Fair Voltage Range 144-171V 144-189V
Bad Voltage Range 0-143V 0-143V

4.1.3 Quick Test

After installing the PDU and connecting equipment, you may test the Automatic Transfer Switch function by temporarily shutting down the UPS system connected to the Primary AC input. When the Primary input UPS is no longer supplying AC power, the PDU will switch from the Primary input to the Secondary input, and the Secondary input LED will illuminate. When the Primary input UPS has been restarted and resumes supplying AC power, the PDU will switch back to the Primary input.
Quick Test

Note: The primary and secondary inputs must be connected to separate sources of utility power. The automatic transfer switch function will be compromised if the primary and secondary inputs are connected to the same utility power source. Do not perform a test with equipment that must remain in productive operation. Any test procedure must prepare for the contingency that the equipment may lose power. Do not test the PDU by detaching power cords which are connected to live power sources,  as this eliminates the connection to ground and places your equipment at risk.

Warranty and Product Registration

2-Year Limited Warranty

Seller warrants this product, if used in accordance with all applicable instructions, to be free from original defects in material and workmanship for a period of two (2) years from the date of initial purchase. If the product should prove defective in material or workmanship within that period, Seller will repair or replace the product, at its sole discretion.

THIS WARRANTY DOES NOT APPLY TO NORMAL WEAR OR TO DAMAGE RESULTING FROM ACCIDENT, MISUSE, ABUSE OR NEGLECT. SELLER MAKES NO EXPRESS WARRANTIES OTHER THAN THE WARRANTY EXPRESSLY SET FORTH HEREIN. EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW, ALL IMPLIED WARRANTIES, INCLUDING ALL WARRANTIES OF MERCHANTABILITY OR FITNESS, ARE LIMITED IN DURATION TO THE WARRANTY PERIOD SET FORTH ABOVE; AND THIS WARRANTY EXPRESSLY EXCLUDES ALL INCIDENTAL AND CONSEQUENTIAL DAMAGES. (Some states do not allow limitations on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from jurisdiction to jurisdiction.)

WARNING: The individual user should take care to determine prior to use whether this device is suitable, adequate or safe for the use intended. Since individual applications are subject to great variation, the manufacturer makes no representation or warranty as to the suitability or fitness of these devices for any specific application.


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FCC Notice

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment  generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. The user must use shielded cables and connectors with this product. Any changes or modifications to this product not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Regulatory Compliance Identification Numbers For the purpose of regulatory compliance certifications and identification, your Tripp Lite product has been assigned a unique series number. The series number can be found on the product nameplate label, along with all required approval markings and information. When requesting compliance information for this product, always refer to the series number. The series number should not be confused with the marking name or model number of the product.

Tripp Lite has a policy of continuous improvement. Specifications are subject to change without notice. Photos and illustrations may differ slightly from actual products.


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Documents / Resources

TRIPP-LITE PDUMH15HVAT Metered Rack-Mount PDU with Automatic Transfer Switch [pdf] Owner's Manual