K
1 or 2 Pole 16A Step relays for direct 35mm
rail (EN60715) mounting
• 17.4mm wide
• Test button with mechanical indicators
• Choice of 7 switching sequences
• AC coils and DC coils
• Identification label
• Possible to connect illuminated push buttons
with the additional part 026.00
• 35mm rail (EN60715) mount
• Cadmium free contact material
20.21/22/24/26/27/28/23
Screw terminal
20.21 20.22, 24, 26, 27, 28 20.23
• Single phase switch 1 NO
(SPST-NO)
• 35mm rail (EN60715) mount
• Double phase switch
• 35mm rail (EN60715) mount
• Double phase switch
1NO+1NC (SPST-NO+SPST-NC)
• 35mm rail (EN60715) mount
For UL ratings see:
“General technical information” page V
For outline drawing see page 3
Contact specification
Contact configuration 1 NO (SPST-NO) 2 NO (DPST-NO) 1NO+1NC (SPST-NO+SPST-NC)
Rated current/Maximum peak current A 16/30 16/30 16/30
Rated voltage/
Maximum switching voltage VAC 250/400 250/400 250/400
Rated load AC1 VA 4000 4000 4000
Rated load AC15 (230VAC) VA 750 750 750
Nominal lamp rating:
230V incandescent/halogen W 2000 2000 2000
fluorescent tubes with
electronic ballast W 1000 1000 1000
fluorescent tubes with
electromechanical ballast W 750 750 750
CFL W 400 400 400
230V LED W 400 400 400
LV halogen or LED with
electronic ballast W 400 400 400
LV halogen or LED with
electromechanical ballast W 800 800 800
Minimum switching load mW (V/mA) 1000 (10/10) 1000 (10/10) 1000 (10/10)
Standard contact material AgSnO2AgSnO2AgSnO2
Coil specification
Nominal voltage (UN) VAC (50/60Hz) 8 - 12 - 24 - 48 - 110 - 120 - 230 - 240
VDC 12 - 24 - 48 - 110 12 - 24 - 48 - 110 12 - 24 - 48 - 110
Rated power AC/DC VA (50Hz)/W 6.5/5 6.5/5 6.5/5
Operating range AC (0.85…1.1)UN (50Hz)/(0.9…1.1)UN (60Hz)
DC (0.9…1.1)UN(0.9…1.1)UN(0.9…1.1)UN
Technical data
Mechanical life AC/DC cycles 300·103300·103300·103
Electrical life at rated load in AC1 cycles 100·103100·103100·103
Minimum/Maximum impulse duration 0.1s/1h (according to EN60669) 0.1s/1h (according to EN60669) 0.1s/1h (according to EN60669)
Insulation between coil
and contacts (1.2/50µs) kV 4 4 4
Ambient temperature range °C –40…+40 –40…+40 –40…+40
Protection category IP 20 IP 20 IP 20
Approvals (according to type)
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SERIES
20 SERIES
Modular step relays 16A
K
Ordering information
Example: 20 series relay, 35mm rail (EN60715) mount, double phase switch, 2 NO 16A contacts, coil rated at 12VDC, AgSnO2 contacts.
2 0 . 2 2 . 9 . 0 1 2 . 4 0 0 0
Series
Type
2 = 35mm rail (EN60715) mount
No. of poles
1 = Single phase switch 1 NO (SPST-NO)
2 = Double phase switch 2 NO (DPST-NO)
3 = Double phase switch 1 NC+ 1 NO (SPST-NO+SPST-NC)
4 = 4 sequence double phase switch 2 NO (DPST-NO)
6 = 3 sequence double phase switch 2 NO (DPST-NO)
7 = 3 sequence double phase switch 2 NO (DPST-NO)
8 = 4 sequence double phase switch 2 NO (DPST-NO)
Contact material
0 = AgNi
4 = AgSnO2
Coil voltage
See coil specifications
Coil version
8 = AC (50/60Hz)
9 = DC
Technical data
Insulation
Dielectric strength
between supply and contacts VAC 3500
between open contacts VAC 2000
between adjacent contacts VAC 2000
Other data
Power lost to the environment
with rated current and coil deenergised W 1.3 (20.21, 20.23, 20.28) 2.6 (20.22, 20.24, 20.26, 20.27)
Screw torque Nm 0.8 0.8
Coil terminals Contact terminals
Max. wire size solid cable stranded cable solid cable stranded cable
mm21x4 / 2x2.5 1x2.5 / 2x2.5 1x6 / 2x4 1x4 / 2x2.5
AWG 1x12 / 2x14 1x14 / 2x14 1x10 / 2x12 1x12 / 2x14
If the coil is operated for a prolonged period of time, adequate ventilation of the relays must be provided - suggested gap of 9mm between adjacent
relays.
Coil specifications
DC version data
Nominal
voltage
Coil
code
Operating range
Resistance
Consumption
I at UN
UNUmin Umax R
V V V ΩmA
12 9.012 10.8 13.2 27 440
24 9.024 21.6 26.4 105 230
48 9.048 43.2 52.8 440 110
110 9.110 99 121 2330 47
AC version data
Nominal
voltage
Coil
code
Operating range
Resistance
Consumption
I at UN
UNUmin Umax R (50Hz)
V V V ΩmA
88.008 6.8 8.8 4 800
12 8.012 10.2 13.2 7.5 550
24 8.024 20.4 26.4 27 275
48 8.048 40.8 52.8 106 150
110 8.110 93.5 121 590 64
120 8.120 102 132 680 54
230 8.230 192 253 2500 28
240 8.240 204 264 2700 27.5
Type Number
of steps
Sequence
1 2 3 4
20.21 2
20.22 2
20.23 2
20.24 4
20.26 3
20.27 3
20.28 4
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20 SERIES
Modular step relays 16A
20
SERIES
K
Wiring diagrams
L
N
Example: 230VAC supply voltage.
L
N
Example: 24VAC supply voltage.
Outline drawings
20.21
Screw terminal
20.23
Screw terminal
20.22/24/26/27/28
Screw terminal
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Modular step relays 16A
K
Accessories
Module for use with illuminated push-buttons
Type 026.00
Sealed construction, 7.5cm insulated flexible wire termination.
Example of wiring diagram of type 026.00
This module is necessary when using between 1 and a maximum of 15
illuminated push buttons in the coil circuit (Each 1.5mA max, 230VAC).
It must be connected in parallel to the coil of the relay.
020.01
Adaptor for panel mounting, 17.5mm wide 020.01
020.24
Sheet of marker tags, plastic, 24 tags, 9x17mm 020.24
022.09
Separator for rail mounting, plastic, 9mm wide 022.09
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20 SERIES
Modular step relays 16A
20
SERIES