With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoEnvMonSupplyStatusIndex
cisco Environmental Monitor Supply Status Index
1.3.6.1.4.1.9.9.13.1.5.1.1
Unique index for the power supply being instrumented. This index is for SNMP purposes only, and has no intrinsic meaning.
Back to CISCO-ENVMON-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoEnvMonSupplyStatusIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.