Specifications are subject to change without notice (26.10.99)
1
Type EFA
Current and Voltage Controls
Frequency Monitoring Control
• Microprocessor-based frequency
measurement
• 10-position rotary switch for selection of bandwidth
• Separate setting of upper/lower limits
• Monitors on own power supply
• 2 separately adjustable time functions (0.1-30 s)
• Quartz-controlled digital circuit
• Selectable centre frequency 50/60 Hz
• Output: 2 x 5 A SPDT relays (one relay for each level)
• For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 45 mm Euronorm housing
• LED-indication for power supply ON
• Two LED's indicating fault and/or status of relay
output (flashing when timing)
• Galvanically separated power supply
Product Description
Ordering Key
Housing
Function
Type
Output
Power supply
EFA is monitoring the fre-
quency of an AC power sup-
ply with the possibility of sepa-
rate adjustment of upper/
lower limits. This relay offers
the user many application
possibilities e.g.
in connec-
tion with wind-driven genera-
tors or similar equipment.
Type Selection
Mounting
Output
Measuring range
Supply: 24 VAC
Supply: 115 VAC
Supply: 230 VAC
For DIN-rail
2 x SPDT
50-60 Hz
EFA C 024
EFA C 115
EFA C 230
Input Specifications
Input
Through terminals A1 & A2
Measuring on own power
supply
Measuring range
Upper level
Lower level
Bandwidth selectable by
2 separate rotary switches
0.5 Hz
0.5 Hz
1.0 Hz
1.0 Hz
1.5 Hz
1.5 Hz
2.0 Hz
2.0 Hz
2.5 Hz
2.5 Hz
3.0 Hz
3.0 Hz
4.0 Hz
4.0 Hz
5.0 Hz
5.0 Hz
6.0 Hz
6.0 Hz
10.0 Hz
10.0 Hz
Output Specifications
Output
2 x SPDT relay
Rated insulation voltage
250 VAC (contact/elect.)
Contact ratings (AgCdO)
µ (micro gap)
Resistive loads
AC 1
5 A, 250 VAC
DC 1
5 A, 24 VDC
Small inductive loads AC 15
2 A, 250 VAC
DC 13
3 A, 24 VDC
Mechanical life
≥ 40 x 106 operations
Electrical life
≥ 105 operations
(at max load)
Operating frequency
≤ 7200 operations/h
Dielectric strength
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Supply Specifications
Power supply
Overvoltage cat. III (IEC 60664)
Rated operational voltage
(IEC 60038)
Through pins A1 & A2 024
24 VAC ±15%, 40 to 70 Hz
115
115 VAC ±15%, 40 to 70 Hz
230
230 VAC ±15%, 40 to 70 Hz
Voltage interruption
≤ 40 ms
Dielectric voltage
≥ 2 kVAC (rms)
Rated impulse withstand
voltage
4 kV (1.2/50 µs)
Rated operational power
3 VA
EFA C 230
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