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Nominal AC Voltage
100 Vrms
240 Vrms
Higher voltages possible with external step-down transformer
Standard levels: 100 / 110 / 120 / 200 / 208 / 220 / 230 / 240 Vrms.

May be installed phase-to-neutral or phase-to-phase, provided nominal voltage is in range.

CAT II installation.

50 / 60 / 400 Hz.

If an external step-down transformer is used, impulse threshold accuracy may be degraded.

Nominal AC current
< 10 mA
< 100
Maximum current occurs during rapid voltage increase. Current is non-sinusoidal and non-symmetrical.
Relay contact outputs
300 mA,
30 V AC or DC
Relay outputs are dry contacts.

Contacts open when a problem is detected

Minimum duration that contacts will be open is approximately 3 seconds, regardless of the event duration.

Maximum duration that contacts will br open is the event duration plus the duration threshold.

Relay contact isolation from AC input
1500 Vrms
Provides “Basic Insulation” per IEC 61010.

Measured between AC input terminals (1 and 2 connected together) and all relay contact terminals (3, 4, 5, 6, 7, and 8 connected together).

Max. Rel. Humidity

80% @ 31°C
Designed for indoor use.

Install fully enclosed in a grounded (earthed) recognized metal enclosure.

Max relative humidity 80% at up to 31°C decreasing linearly to 50% at 40°C.

Transient over voltage Category II:
local level, appliances, portable equipment, etc.

Pollution Degree 1:
No pollution or only dry, non-conductive pollution occurs.

There are no user-serviceable parts in the PQ1.

The fuse is type T100mA 240V, and is factory-replaceable.

There are no cleaning instructions for the PQ1.

Recommended Torque for Screw Terminals
0.8 N-m
7 in-lb

PQ1 – Accuracy
RMS voltage thresholds
±0.5% FS
RMS calibrated.

Sensed differentially as digital positive-peak-sense-equivalent, referenced to Terminal 1. Voltage harmonics may affect RMS accuracy, but any effect mimics the effect on an electronic load.

IEC 61000-4-30 Class B.

Accuracy specified at 50/60/400 Hz.

300 Vrms full scale.

Duration thresholds
±0.5 cycle
Duration thresholds are specified in milliseconds, but uncertainty is specified in cycles, e.g. a 100 millisecond duration threshold at 50 Hz (20 millisecond cycle) is 100 milliseconds ± 20 milliseconds.

Applies to dip and swell thresholds.

Impulse threshold
450 Vpk
Nominal impulse threshold is fixed at 450Vpk, regardless of nominal voltage, unlike dip and swell thresholds which are expressed in percent of nominal.

Specified for positive 1.2 x 50 uS impulse, per IEC 61000-4-5.

Useful response from 500×10-9 seconds to 200×10-6 seconds.

Sensed differentially as positive peak, referenced to Terminal 1, through high-pass filter, i.e. the impulsive difference from the fundamental sine wave is sensed.

Frequency threshold
±0.05 Hz
Measured by timing successive zero-crossings through an 800 Hz 1-pole low-pass filter.

IEC 61000-4-30 Class B.

Frequency is measured only during start-up, Clear events, and Test events.

400 Hz = 1~3 ms period; 60 Hz = 15~18 ms period; 50 Hz = 19~22 ms period. Any other period duration causes frequency initialization to repeat.

PQ1 – Immunity
RMS voltage immunity:
dips, swells, interruptions
0 Vrms
(500 ms),
70 Vrms (continuous)
300 Vrms
The same immunity level applies regardless of the setting on the Nominal Voltage switch.

At approximately 350 Vrms for more than 100 milliseconds, a factory-replaceable fuse may open.

Hold-up time: continues to operate properly at 0 Vrms for a minimum of 500 ms (100Vrms) to 3 seconds (240Vrms).

When power is removed for longer than the hold-up time, all relay outputs will show an event.

Memory of events is retained forever, regardless of absence of power.
Memory can only be cleared by pressing the Clear button.

Exceeds the requirements of IEC 61000-6-2, Table 4, Section 4.4 and 4.5

Fast transient immunity
±2 kV, 5/50 ns, 5 kHz rep
Test standard IEC 61000-4-4.

Exceeds the requirements of IEC 61000-6-2, Table 4, Section 4.2

Surge immunity
±2 kV, 1.2/50 us
±4 kV, ±500A, 100 kHz ring wave
Test standard IEC 61000-4-5.

Exceeds the requirements of IEC 61000-6-2, Table 4, Section 4.3. Line-to-earth surge requirements do not apply.

Excessive surge may cause a factory-replaceable fuse to open.

Radio frequency common mode immunity
10V, 150 kHz ~ 80 MHz, 1kHz AM
Test standard IEC 61000-4-6.

May cause variations in RMS reading.

Exceeds the requirements of IEC 61000-6-2, Table 4, Section 4.1.

Power Standards Lab
980 Atlantic Ave.
Alameda, California 94501
TEL: ++1.510.522.4400
US: 1.888.SEMI.F47 or 1.888.736.4347

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