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Motor Protective Relay

K2CM

K2CM

Solid-state Relay Enables Choice of Three Operating Functions (Overcurrent, Openphase,and Reverse-phase)

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Ratings

Other features, such as 100% overcurrent capacity and flush mounting are also available.

Supply voltage of motor circuit200/220, 400/440 VAC, 50/60 Hz
Supply voltage of control circuit100/110/120, 200/220/240, 400/440 VAC, 50/60 Hz
Insulation breakdown of output
contact		500 VAC
Operating voltage/current of
output contact (pf = 0.4 when
breaking contact)		NO contact: 120 VAC/2 A, 240 VAC/1 A, 440 VAC/0.5 A, 110 VDC/0.2 A, 220 VDC/0.1 A
NC contact: 120 VAC/5 A, 240 VAC/2 A, 440 VAC/1 A, 110 VDC/0.2 A, 220 VDC/0.1 A
Contact form of output contactCurrent reverse-phase detection models: SPST-NO + SPST-NC
Voltage reverse-phase detection models: SPDT
Operating current range of input
circuit		2 to 160 A (Number of passes: 1)
Operating voltage range of control
circuit		85% to 110% of rated voltage, but operates normally at 50% of open-phase supply voltage
Operating frequency range of control
circuit		95% to 105% of rated frequency
Power consumptionApprox. 3 VA (in standby state); 5 VA (in operating state)
Overcurrent function operating value115 ±10% of the setting value
Overcurrent function operating time
setting range		Inverse Type
Inverse time both at startup and during operation:
Timer scale × 1 (s) at 600% overload
Timer scale × 3 (s) at 200% overload
Note: The above values are for a time factor setting of 1.
Instantaneous Type
Fixed time at starting (start-up lock)
Time setting value (varies between 2 and 40 s) at 140% overload and starting
Instantaneous during operation: 0.5 s max. (when current is increased from 100 to 140% of
the set current value)
Case colorMunsell 5Y7/1
Overcurrent function operating
time characteristics		Inverse type: ±10% of maximum setting value (at 600% overload)
Instantaneous type: ±20% of maximum setting value (at 140% overcurrent and at starting)
Overcurrent function resetting value100% min. of the setting value
Overcurrent function start-up
operating value		Inverse type: Not applicable
Instantaneous type: 30% max. of the setting value (See note.)
Open-phase operating value85% max. of the set current value (at open-phase)
Open-phase operating time2 s max. (at overcurrent operating value)
Reverse-phase operating value50% max. of the current value (80% max. of the operating voltage)
Reverse-phase operating time1 s max. (at overcurrent operating value)
Imbalance operating value85% of the set current value
Current imbalance factorHigh: 35 ±10%; Low: 60% min. (at overcurrent operating value)

Note:The start-up lock timer restarts when the operating value at starting becomes less than 30% of the set current value.

Characteristics

Variation due to
temperature
fluctuation		At 20 ±20 °COvercurrent: ±5% of operating value, ±10% of operating time
Open-phase: ±10% of operating value, ±10% of operating time
Reverse-phase: ±10% of operating value, ±10% of operating time
At 20 ±30 °COvercurrent: ±10% of operating value, ±20% of operating time
Open-phase: ±20% of operating value, ±20% of operating time
Reverse-phase: ±20% of operating value, ±20% of operating time
Variation due to voltage fluctuationAt 85% to 110% of
rated voltage		Overcurrent: ±5% of operating value, ±10% of operating time
Open-phase: ±5% of operating value, ±10% of operating time
Reverse-phase: ±5% of operating value, ±10% of operating time
Variation due to frequency fluctuationAt 95% to 105% of
rated frequency
Insulation resistance10 MΩ min. (between current-carrying terminals and mounting panel)
5 MΩ min. (between current-carrying terminals and between contact poles)
Dielectric strength2,500 VAC (between current-carrying terminals and mounting panel and between current-carrying terminals)
1,000 VAC (between contact poles)
Permissible impulse voltageCurrent reverse-phase detection models:
6,000 V (between current-carrying terminals and mounting panel)
4,500 V (between current-carrying terminals and between control power supply terminals)
Waveform: 1.2/50 μs
Voltage reverse-phase detection models:
4,500 V (between current-carrying terminals and mounting panel)
Waveform: 1.2/50 μs
Overcurrent strength of
main circuit		No abnormality develops when 20 times the set current value is applied for 2 s, 2 times with a 1minute interval.
Overvoltage strength of
control power supply circuit		No abnormality develops when 1.15 times the relay's rated voltage is applied once for 3 hours.
Variation due to
waveform distortion		No malfunction occurs when pulse containing 100% of the 2nd to 9th harmonics is applied (open phase switch set to "Low"). (See note.)
VibrationMalfunction: 10 to 55 Hz, 0.3-mm double amplitude (in X, Y, and Z directions for 10 minutes each)
Destruction: 10 to 25 Hz, 2-mm double amplitude (in X, Y, and Z directions for 2 hours each)
ShockMalfunction: 98 m/s2 (approx. 10 G) in X, Y, and Z directions
Destruction: 294 m/s2 (approx. 30 G) in X, Y, and Z directions
Test current
(reference only)		Operating timeSet time value
Setting characteristics of operating timeApprox. ±30% of the maximum setting value
Service lifeElectrical: 10,000 operations
Ambient temperatureOperating: -10 to 60 °C (with no icing)
Storage: -25 to 65 °C
Humidity35% to 85%
Altitude2,000 m max.

Note:This means that no malfunction occurs with the open-phase element, but the operating value of the overload element may vary.

Caution: In the interenst of product improvement, specifications are subject to change without notice.

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