Brochure

The superiority of electronic overload relays
versus traditional thermal overload relays
• Faster response time under phase loss and phase
unbalance conditions
• Increased motor life due to thermal modeling design
• Common design for single-phase and three-phase applications
Integral ground fault protection
• The C440 has built-in ground fault protection capabilities,
eliminating the need to purchase and install separate CTs
and ground fault modules
• True simultaneous ground fault protection and communications
capabilities—unique in the industry
• Integral design reduces inventory, speeds up installation time
and delivers physical space savings
Enhanced protection and monitoring
Figure 1. Reduction in Average Life of a Motor, E
M
, When the Winding
Is Continuously Overheated
Percent (%)
0
25
50
70
100
E
M
+9°F +18°F
Temperature Rise
+27°F +36°F
G
: Temperature Limit of the Insulation
G
Phase Loss Trip Times under Full Load Current Conditions
50
Approximate Trip Time
in Seconds
Traditional
Thermal
Overload Relay
C440 Electronic
Overload Relay
45
40
35
30
25
20
15
10
5
0
Figure 1. Reduction in Average Life of a Motor, E
M
, When the Winding
Is Continuously Overheated
Percent (%)
0
25
50
70
100
E
M
+9°
F +18°F
Temperature Rise
+27°F +36°F
G
: Temperature Limit of the Insulation
G
Figure 2. Comparison of Phase Loss Trip Times under Full Load Current
Conditions
50
Approximate Trip Time
in Seconds
Traditional
Electromechanical
Overload Relay
Electronic
Overload Relay
45
40
40
2
35
30
25
20
15
10
5
0
Phase Loss Trip Times Under Full Load Current Conditions
Separate current transformers
(CTs) or ground fault modules
are no longer needed.
4 EATON Eaton C440 relay