Specifications are subject to change without notice (01.10.2003) 1
Type Selection
Switching mode Rated operational Control voltage Rated operational Options
voltage current
A: Zero Switching 23: 230 VACrms A: 20-280 VAC/22-48 VDC 25 : 25 AACrms Z: Overvoltage
B: Instant-on switching 60: 600 VACrms D: 3 - 32 VDC* 50 : 50 AACrms protection (self-
75 : 75 AACrms switching)
* 4 to 32 VDC for 600 VAC types 100:100 AACrms
125:125 AACrms
Rated Non-rep. Control Rated operational current
operational voltage voltage 25 A 50 A 75 A 100 A 125 A
voltage
230 VACrms 650 V
p
3 - 32 VDC RAM1A23D25 RAM1A23D50 RAM1A23D75 RAM1A23D100 RAM1A23D125
20-280 VAC/22-48 VDC RAM1A23A25 RAM1A23A50 RAM1A23A75 RAM1A23A100 RAM1A23A125
600 VACrms 1200 V
p
4 - 32 VDC RAM1A60D25 RAM1A60D50 RAM1A60D75 RAM1A60D100 RAM1A60D125
20-280 VAC/22-48 VDC RAM1A60A25 RAM1A60A50 RAM1A60A75 RAM1A60A100 RAM1A60A125
Options
1 Overvoltage protection by self-switching: add suffix Z to include. Example: RAM1A60D25Z
2 690 VACrms rated operational voltage available on request for 75A, 100A and 125A types. Example: RAM1A69D75
• Zero switching (RAM1A) or instant-on
switching (RAM1B) AC Solid State Relay
• Direct copper bonding (DCB) technology
• LED indication
• Clip-on IP 20 protection cover
• Self-lifting terminals
• Housing free of moulding mass
• 2 input ranges: 3-32 VDC* and 20-280 VAC/22-48 VDC
• Operational ratings up to 125 AACrms and 600 VACrms
• Non-repetitive voltage: Up to 1200 V
p
• Opto-insulation: > 4000 VACrms
• Integrated overvoltage protection by self
switching (suffix “Z” option)
Product Description
The industrial, 1-phase relay
with antiparallel thyristor output is the most widely used
industrial SSR due to its multiple application possibilities.
The relay can be used for
resistive, inductive and
capacitive loads. The zero
switching relay switches ON
when the sinusoidal curve
crosses zero and switches
OFF when the current cross-
Solid State Relay
Number of poles
Switching mode
Rated operational voltage
Control voltage
Rated operational current
Options
Ordering Key
Solid State Relays
es zero. The instant-on relay
with DC control input can be
used for phase angle control.
The built-in snubber secures
transient protection. The LED
indicates the status of the
control input. The clip-on cover secures touch protection
(IP 20). Protected output terminals can handle cables up
to 16 mm
2
.
Selection Guide
Industrial, 1-Phase ZS (IO) w. LED
Types RAM1A, RAM1B
RAM 1 A 60 D 125 Z
2 Specifications are subject to change without notice (01.10.2003)
Rated insulation voltage
Input to output ≥ 4000 VACrms
Output to case ≥ 4000 VACrms
Insulation
Operating temperature -40° to +80°C (-40˚ to +176˚F)
Storage temperature -40° to +100°C (-40˚ to +212˚F)
Junction temperature ≤ 125˚C (257˚F)
RAM1...25 RAM...50 RAM1...75 RAM1...100 RAM...125
Rated operational current
AC51 @ Ta=25°C 25 Arms 50 Arms 75 Arms 100 Arms 125 Arms
AC53a @ Ta=25°C 5 Arms 15 Arms 17 Arms 20 Arms 30 Arms
Min. operational current 150 mA 150 mA 150 mA 150 mA 150mA
Rep. overload current t=1 s < 55 AACrms < 125 AACrms < 130 AACrms < 150 AACrms < 200 AACrms
Non-rep. surge current t=10 ms 250 A
p
600 A
p
800 A
p
1000 A
p
1500A
p
Off-state leakage current @
rated voltage and frequency < 3 mArms < 3 mArms < 3 mArms < 3 mArms < 3 mArms
I2t for fusing t= 1-10 ms < 310 A2s < 1800 A2s < 3200 A2s < 6600 A2s <18000 A2s
Critical dI/dt ≥ 100 A/µs ≥ 100 A/µs ≥ 100 A/µs ≥ 100 A/µs ≥ 100 A/µs
On-state voltage drop ≤ 1.6 Vrms ≤ 1.6 Vrms ≤ 1.6 Vrms ≤ 1.6 Vrms ≤ 1.6 Vrms
Critical dV/dt off-state min. 1000 V/µs 1000 V/µs 1000 V/µs 1000 V/µs 1000 V/µs
Input Specifications
RAM1A, RAM1B
Output Specifications
RAM1...D.. RAM1...A..
Control voltage range
RAM1.23. 3-32 VDC 20-280VAC, 22-48 VDC
RAM1.60. 4-32 VDC 20-280VAC, 22-48 VDC
Pick-up voltage
RAM1.23. 2.5 VDC 18 VAC/DC
RAM1.60. 3.5 VDC 18 VAC/DC
Reverse voltage ≤ 32 VDC Drop out voltage ≤ 1.2 VDC ≤ 6 VAC/DC
Input current @ max input voltage ≤ 12 mA ≤ 20 mA
Response time pick-up ≤ 12ms
RAM1A ≤ 1/2 cycle
RAM1B ≤ 0.1 ms
Response time drop-out ≤ 1/2 cycle ≤ 40ms
General Specifications
RAM1.23.. RAM1.60..
Operational voltage range 24 to 265 VACrms 24 to 660 VACrms
Non-rep. peak voltage ≥ 650 V
p
≥ 1200 V
p
Zero voltage turn-on ≤ 10 V ≤ 10 V
Operational frequency range 45 to 65 Hz 45 to 65 Hz
Power factor
> 0.5 @ 230 VACrms > 0.5 @ 600 VACrms
Approvals UL, cUL, CSA*, VDE** UL, cUL, CSA*, VDE**
CE-marking Yes Yes
* Approval pending ** VDE0805
Thermal Specifications
Specifications are subject to change without notice (01.10.2003) 3
A1(+)
A2( - )
T1
L1
ZC
IO
REGULATION
Weight
25 A, 50 A Approx. 60 g
75 A, 100 A, 125 A Approx. 100 g
Housing material Noryl, black
Baseplate
25 A, 50 A Aluminium
75 A, 100 A, 125 A Copper, nickel-plated
Housing Specifications
Relay
Mounting screws M5
Mounting torque 1.5-2.0 Nm
Control terminal
Mounting screws M3 x 9
Mounting torque 0.5 Nm
Power terminal
Mounting screws M5 x 9
Mounting torque 2.4 Nm
Dimensions
APPLY
HEATSINK
COMPOUND
LED
Functional Diagram
RAM1A, RAM1B
Heatsink Dimensions (load current versus ambient temperature)
RAM..25
T
A
Ambient temp. [°C]
25.0
22.5
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
Power
dissipation [W]
Thermal resistance
[K/W]
Load
current [A]
3.23 2.80 2.37 1.94 1.51 1.09 23
3.70 3.21 2.73 2.24 1.75 1.26 21
4.30 3.74 3.17 2.61 2.05 1.49 18
5.07 4.41 3.76 3.10 2.44 1.78 15
6.12 5.33 4.54 3.75 2.96 2.17 13
7.58 6.61 5.64 4.66 3.69 2.72 10
9.80 8.55 7.30 6.05 4.80 3.55 8
13.5 11.80 10.09 8.37 6.66 4.94 6
- 18.3 15.7 13.04 10.39 7.74 4
- - - - - 16.2 2
20 30 40 50 60 70
RAM..50
T
A
Ambient temp. [°C]
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
Power
dissipation [W]
Thermal resistance
[K/W]
Load
current [A]
1.25 1.07 0.88 0.70 0.52 0.34 55
1.46 1.25 1.04 0.84 0.63 0.42 48
1.73 1.49 1.25 1.01 0.77 0.52 41
2.08 1.80 1.51 1.23 0.94 0.66 35
2.56 2.22 1.87 1.53 1.18 0.84 29
3.24 2.81 2.38 1.95 1.52 1.09 23
4.26 3.71 3.15 2.59 2.03 1.47 18
5.99 5.22 4.45 3.67 2.90 2.12 13
9.49 8.27 7.06 5.85 4.64 3.43 8
- 17.5 15.0 12.4 9.91 7.39 4
20 30 40 50 60 70
4 Specifications are subject to change without notice (01.10.2003)
Heatsink Dimensions (cont.)
Carlo Gavazzi Heatsink Thermal for power
(see Accessories) resistance... dissipation
No heatsink required --- N/A
RHS 300 5.00 K/W > 0 W
RHS 100 3.00 K/W > 25 W
RHS 45A 2.70 K/W > 55 W
RHS 45B 2.00 K/W > 60 W
RHS 90 1.35 K/W > 60 W
RHS 45A plus fan 1.25 K/W > 0 W
RHS 45B plus fan 1.20 K/W > 0 W
RHS 112 1.10 K/W > 100 W
RHS 301 0.80 K/W > 80 W
RHS 90 plus fan 0.45 K/W > 0 W
RHS 112 plus fan 0.40 K/W > 0 W
RHS 301 plus fa 0.25 K/W > 0 W
Consult your distribution > 0.25 K/W N/A
Infinite heatsink - No solution
--- N/A
Heatsink Selection
RAM1A, RAM1B
RAM..75
T
A
Ambient temp. [°C]
75.0
67.5
60.0
52.5
45.0
37.5
30.0
22.5
15.0
7.5
Power
dissipation [W]
Thermal resistance
[K/W]
Load
current [A]
0.94 0.82 0.70 0.58 0.47 0.29 85
1.10 0.96 0.82 0.69 0.55 0.34 73
1.30 1.14 0.98 0.81 0.65 0.41 61
1.57 1.38 1.18 0.98 0.79 0.49 51
1.95 1.70 1.46 1.22 0.97 0.61 41
2.48 2.17 1.86 1.55 1.24 0.78 32
3.32 2.90 2.49 2.07 1.66 1.04 24
4.75 4.15 3.56 2.97 2.37 1.48 17
7.68 6.72 5.76 4.80 3.84 2.40 10
- 14.59 12.50 10.42 8.34 5.21 5
20 30 40 50 60 75
RAM..100
T
A
Ambient temp. [°C]
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
Power
dissipation [W]
Thermal resistance
[K/W]
Load
current [A]
0.60 0.52 0.43 0.34 0.26 0.17 117
0.74 0.64 0.54 0.44 0.34 0.24 101
0.91 0.79 0.68 0.56 0.45 0.33 87
1.09 0.96 0.82 0.68 0.55 0.41 73
1.33 1.16 1.00 0.83 0.66 0.50 60
1.66 1.45 1.24 1.04 0.83 0.62 48
2.16 1.89 1.62 1.35 1.08 0.81 37
3.01 2.64 2.26 1.88 1.51 1.13 27
4.73 4.14 3.55 2.96 2.37 1.78 17
9.94 8.70 7.45 6.21 4.97 3.73 8
20 30 40 50 60 70
RAM..125
T
A
Ambient temp. [°C]
125.0
112.5
100.0
87.5
75.0
62.5
50.0
37.5
25.0
12.5
Power
dissipation [W]
Thermal resistance
[K/W]
Load
current [A]
0.63 0.55 0.47 0.40 0.32 0.24 126
0.73 0.64 0.54 0.45 0.36 0.27 110
0.84 0.74 0.63 0.53 0.42 0.32 95
0.99 0.87 0.74 0.62 0.50 0.37 81
1.20 1.05 0.90 0.75 0.60 0.45 67
1.48 1.30 1.11 0.93 0.74 0.56 54
1.92 1.68 1.44 1.20 0.96 0.72 42
2.65 2.32 1.98 1.65 1.32 0.99 30
4.12 3.60 3.09 2.57 2.06 1.54 19
8.55 7.48 6.41 5.34 4.27 3.21 9
20 30 40 50 60 70
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