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Optima PDUs

Product Selector

MPD 533009-000
3U PDU Features

Product Overview

Quality products from Marway Power Solutions provide a solid foundation of reliable power distribution for any equipment set. For 30 years Marway has specialized in build-to-order and customized systems designed to save space and weight while meeting the unique needs of each application.

PDU family MPD 533 consists of fifteen individual models covering a wide range of configurations. All models include a 3U x 9.0" chassis and a large number of breakers for discrete control and protection of outlets. These units are designed to receive three phase 120/208 VAC power through a NEMA L21-30P connector.

EMI Protection

EMI protection is provided by a power line filter. Noise and harmonics in the facility power lines can cause problems for sensitive electronic equipment. A filter in the PDU helps prevent noise and harmonics from reaching downstream equipment.

Surge Protection

Spike and surge protection is provided by metal oxide varistors (MOVs). Facility power lines can sometimes transmit a sudden increase in voltage. Even though the voltage spike or surge may be very short in duration, it can damage equipment. The MOV in the PDU clamps the line voltage so it cannot exceed a specified value, thus protecting any connected equipment.

Current Protection

Overcurrent protection is provided by one or more circuit breakers. Equipment faults can cause excessive power to be pulled from facility power lines. This can damage the equipment and power cabling. The circuit breaker in the PDU protects downstream equipment by opening the power line if too much current is being consumed.

EPO and Remote Control

The N.O./N.O. remote type label designates a Normally Open Enable/Normally Open Disable interface for the remote operation of the PDU.

The N.O./N.O. remote interface requires an external normally open signal to ENABLE the switched outputs in the PDU. The external ENABLE contacts must be closed to turn on the PDU outputs. The interface also supports an external normally open signal to DISABLE the switched outputs, which is equivalent to an EPO response. When the external DISABLE contacts are closed, the EPO is initiated. Note that if both signals are applied, DISABLE (EPO) always has priority.

Our Universal Control Panels, are popular systems for providing remote on/off/EPO control of one or more PDUs.


Remote switching allows the power receptacles to be enabled or disabled via an external control signal. This feature is useful for implementing external interlock circuits, or simply providing the convenience of remote control. The remote interface is controlled through one or more 3-pin remote connectors on the PDU.

The delay connector provides a delayed enable signal. This signal can be used to control other PDUs in a daisy-chain configuration. A cable is used to connect the delay output of one PDU to the remote connector of a second PDU. In this configuration, the first PDU is switched on, and then the second PDU is switched on after the time delay. This allows two or more PDUs to switch on in a timed sequence.

Local switching allows the power receptacles to be enabled or disabled via one or more switches on the front panel of the PDU.

Our Universal Control Panels, are popular systems for providing remote on/off/EPO control of one or more PDUs.


Read the product Feature Descriptions for important details. Specifications are subject to change without notice.

[1] Certain details of the circuitry may only be revealed by the schematic (available separately).

[2] All ratings of amps are maximum. See model details for deratings.

[3] Feature codes: Enet = Ethernet, VMtr = volts meter, AMtr = amps meter, rEPO = remote EPO, Seq = outlet sequencing, EMI = EMI filter, Srg = surge suppression

[4] Outlet Codes: (S) = switched, (V) = monitored voltage, (A) = monitored amps. Check Feature Descriptions for details.