The Server Technology Smart CDU provides local LED input current monitoring, allowing IT personnel to determine safe levels of loading on a per-phase basis while installing equipment into the rack/cabinet. The integral PIPS technology provides highly-accurate measurement of current, voltage, active power, apparent power, power factor, crest factor, and accumulated energy. These power data points, along with temperature and humidity measurements (provided via optional probes), are accessible through the built-in Web and CLI interfaces as well as through SNMP. The Smart “Master" CDU can be connected to the Smart “Link" CDU to extend the network access to the redundant or secondary power feed.



Sentry CDU Specifications
Item # Available Input
Rated Amperage Available Input Cord Outlets Dimensions
(L x W x D)
CS39CS-2/E 208V 20/30A with PIPS
220-240V L-N Nominal,
≤16A IEC 60309 6hr 3P+N+PE Red,
3m, 5-C, H05VV-F, 4.0mm²
(24) IEC 60320/C13
(12) IEC 60320/C19
70.0 x 1.75 x 2.5 in.
(1788 x 45 x 64 mm)
220-240V L-N Nominal,
≤32A IEC 60309 6hr 3P+N+PE Red,
3m, 5-C, H05VV-F, 4.0mm²
(24) IEC 60320/C13
(12) IEC 60320/C19
70.0 x 1.75 x 2.5 in.
(1788 x 45 x 64 mm)
* CL part numbers refer to the Expansion CDU
** 3.5 in. (89 mm) at breakers
Additional Features and Specifications
TUVGS Mark to EN 60950-1:2006 + A11
• EMC to EN 55022 Class A, EN 55024, CISPR 22 Class A
• CE Mark

10/100 Mbps Ethernet (RJ-45 connector)
• RS-232 serial (RJ-45 connector)
• Two (2) temperature/humidity sensor inputs (4P4C)
• Link port (RJ-12)
• Web-browser GUI and command-line-interface (CLI)
HTTP/HTTPS, SSLv3/TLSv1, SSHv2, Telnet, SNMPv2c and v3 (GET,

Branch Circuit Protection
• UL489 compliant circuit breakers, 1-pole, 20A
• Six (6) branches
• Current Rating: ≤ 16A
• Voltage Rating: 220V-240V nominal, 50/60Hz

  • EMTH-1-1 Combination Temperature/Humidity Probe, 10ft (3m)
  • EMCU-1-1B Environmental Monitor adding:
  • Two (2) EMTH-1-1 temperature/humidity ports (one probe included)
  • One (1) EMWS-1-1 water sensor port (probe sold separately)
  • Four (4) dry contact (NO/NC) monitoring points
  • One (1) 8-bit analog-to-digital converter (0 to 5VDC)
  • SPM (Sentry Power Manager):
  • Monitor and manage multiple PDUs from a single point
  • Monitor and manage alarm conditions
  • Create reports and trends on stored data
  • Analyze power usage per phase
  • Optional appliance or virtual version
  • VMware Ready
  • Device / Output Locking Power Cords
  • Multiple options available
  • Contact Server Technology for details.
  • Mounting Brackets
  • Buttons (KIT-0020) included for tool-less mounting.
  • See mounting bracket catalog for more options

Remote Power Monitoring

  • Monitor input power via IP or serial interface.

HTTP/HTTPs Web Configuration & Control

  • Use the Sentry Web interface to configure each unit's network settings. SNMP traps for environmental & power thresholds and firmware updates. Also use the Web interface to monitor key values, including amperage load(s), temperature/humidity and other environmental conditions. SSL security provides a secure HTTPs connection.

SNMP Management & Event Notification

  • The Sentry family of products supports the Simple Network Management Protocol (SNMP). This allows network management systems to use SNMP requests to retrieve information such as input power, temperature and humidity. The Sentry includes an SNMP v1 agent supporting standard MIB I and MIB II objects. A private enterprise MIB extension (Sentry3 MIB) is also supported to provide remote power control. SNMP traps can be generated for various events, including Input Current Load Thresholds (min & max), Temperature Thresholds (min & max), Humidity Thresholds (min & max), water indication, and closed contacts (cabinet doors open/close).

Add a Second Tower

  • Connect an Expansion Cabinet PDU to this Smart Cabinet PDU to control two power input circuits and monitor power in the Data Center cabinet (individual or groups) under 1 IP address - our exclusive strategy for managing dual power-supply servers.

Zero U Enclosure

  • A vertical enclosure that occupies Zero Vertical U of rack space in the equipment cabinet. It mounts on the back rails or in the cavity space of the cabinet.

Secure Access - SSH or SSL Protection

  • Secure Shell (SSH), known as Secure Socket Shell, is a Unix-based command interface and protocol for securely getting access to a remote device. Sentry supports SSHv2. Secure Sockets Layer (SSL) is a commonly-used protocol for managing the security of a message transmission on the Internet. SSL is an integral part of most Web browsers (clients) and Web servers. Sentry supports SSLv3/TLSv1.

Integrated Temp/Humidity Probe Support

  • Two (2) RJ-style connectors located on the face panel of the PDU's enclosure provide support for two (2) Integrated Temperature & Humidity Probes with ten-foot (10') cables provide real-time measurements in the data center cabinet.

Firmware Flash Upgradeable

  • Access new firmware updates via FTP for new firmware features and code releases. An update to the firmware does not affect the status of the power outlets.


  • The sentry family of products supports Lightweight Directory Access Protocol (LDAP) Version 3 including LDAPS (LDAP over TSL/SSL). This support enable authentication with LDAP servers; user accounts do not need to be individually created locally on each Sentry device.
  • This allows administrators to pre-define and configure (in each Sentry product, and in the LDAP server) a set of necessary LDAP groups, and access rights for each. User's access rights can then be assigned or revoked simply by making the user a member of one or more pre-defined Sentry LDAP groups. User account can be added, deleted, or changed in the LDAP server without any changes on individual Sentry products.
Sentry LDAP support has been tested in the following environments:
  • Microsoft Active Directory (MSAD)
  • Novell eDirectory (eDir)
  • Open LDAP

RS-232 Control

  • Serial control via any device with a bi-directional serial port, including a PC, laptop, KVM switch, Console Port Access switch, or terminal server.

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