I would go with whats recommended on the data sheet below, what are you connecting it at , these are low end SMB switches they cant take much abuse in that sense , if your looking for something harder go for an industrial ISR router 800 series that are built for harsher environments
The following table lists the specifications for the Cisco SG100D-08
Ethernet Switch.
Item Specification
Model Cisco SG100D-08 Gigabit Switch with
QoS
Standards IEEE 802.3, 802.3u, 802.3ab, 802.1p,
802.3x
Ports Eight RJ-45 10/100/1000 Mbps ports
Cabling Type Category 5 Ethernet
LEDs System, Link/Act 1 through 8
Security Feature Security Slot
Dimensions
(Width by Height by Depth)
5.51" by 1.31" by 5.51"
140 by 33.35 by 140 mm
Unit Weight 15 oz. (0.425 kg)
Power DC12V/1.0A
Certification FCC