## Crydom Solid State Relays

#### PCB Mount Solid State Relays

#### AC Output

#### CX240D5

240Vac / 5 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 5 Amps

Input Voltage

3 - 15Vdc

#### CX380D5

480Vac / 5 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 5 Amps

Input Voltage

4 - 15Vdc

#### CXE240D5

240Vac / 5 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 5 Amps

Input Voltage

15 - 32Vdc

#### CX241

240Vac / 1.5 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.05 - 1.5 Amps

Input Voltage

4 - 10Vdc

#### D2W203F

240Vac / 3 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 3 Amps

Input Voltage

3 - 32Vdc

#### SPF480D25

480Vac / 25 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 25 Amps

Input Voltage

4 - 15Vdc

#### PCB Mount Solid State Relays

#### DC Output

#### CMX60D5

60Vdc / 5 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.002 - 5 Amps

Input Voltage

3 - 10Vdc

#### CMX60D10

60Vdc / 10 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.002 - 10 Amps

Input Voltage

3 - 10Vdc

#### MPDCD3

60Vdc / 3 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.02 - 3 Amps

Input Voltage

3 - 32Vdc

#### Panel Mount Single-Phase Solid State Relays

#### DC Input / Control

#### AC Output

#### CWD48125

600Vac / 125 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 125 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### D2425

240Vac / 25 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 25 Amps

Input Voltage

3 - 32Vdc

#### AC Output

#### D2450

240Vac / 50 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 50 Amps

Input Voltage

3 - 32Vdc

#### AC Output

#### HD4825

480Vac / 25 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 25 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HD4850

480Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 50 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HD4890

480Vac / 90 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 90 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HD48125

480Vac / 125 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 125 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HD6050

600Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 50 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HD6090

600Vac / 90 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 90 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HD60125

600Vac / 125 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 125 Amps

Input Voltage

4 - 32Vdc

#### Panel Mount Single-Phase Solid State Relays

#### AC Input / Control

#### AC Output

#### CWA48125

600Vac / 125 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 125 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### A2425

240Vac / 25 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 25 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### A2450

240Vac / 50 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 50 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA4825

480Vac / 25 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 25 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA4850

480Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 50 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA4890

480Vac / 90 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 90 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA48125

480Vac / 125 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 125 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA6025

600Vac / 25 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 25 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA6050

600Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 50 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA6090

600Vac / 90 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 90 Amps

Input Voltage

90 - 280Vac

#### AC Output

#### HA60125

600Vac / 125 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 125 Amps

Input Voltage

90 - 280Vac

#### Panel Mount Stripwire Solid State Relays

#### DC Input / Control

#### AC Output

#### HBC-D6050 (CMD6050)

600Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 50 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### HBC-D6090 (CMD6090)

600Vac / 90 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 90 Amps

Input Voltage

4 - 32Vdc

#### Panel Mount Stripwire Solid State Relays

#### AC Input / Control

#### AC Output

#### HBC-A6050 (CMD6050)

600Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 50 Amps

Input Voltage

90 - 140Vac

#### AC Output

#### HBC-A6090 (CMD6090)

600Vac / 90 Amp Solid State Relay

Operating Voltage

48 - 660Vac

Load Current

.15 - 90 Amps

Input Voltage

90 - 140Vac

#### Panel Mount Dual & Three-Phase Solid State Relays

#### DC Input / Control

#### AC Output

#### D53TP50D (Three-Phase)

480Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 50 Amps

Input Voltage

4 - 32Vdc

#### AC Output

#### D2440D (Dual Output)

240Vac / 40 Amp Solid State Relay

Operating Voltage

24 - 280Vac

Load Current

.15 - 40 Amps

Input Voltage

4 - 15Vdc

#### AC Output

#### H12D4825DE (Dual Output)

480Vac / 25 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 25 Amps

Input Voltage

15 - 32Vdc

#### AC Output

#### H12D4840D (Dual Output)

480Vac / 40 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 40 Amps

Input Voltage

4 - 15Vdc

#### AC Output

#### H12D4840DE (Dual Output)

480Vac / 40 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 40 Amps

Input Voltage

15 - 32Vdc

#### Panel Mount Dual & Three-Phase Solid State Relays

#### AC Input / Control

#### AC Output

#### A53TP50D (Three-Phase)

480Vac / 50 Amp Solid State Relay

Operating Voltage

48 - 530Vac

Load Current

.15 - 50 Amps

Input Voltage

90 - 280Vac

#### Panel Mount DC Output Solid State Relays

#### DC Input / Control

#### AC Output

#### D06D60 (MOSFET Output)

60Vdc / 60 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.005 - 60 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D06D80 (MOSFET Output)

60Vdc / 80 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.005 - 80 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D06D100 (MOSFET Output)

100Vdc / 80 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.005 - 100 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D1D12 (MOSFET Output)

100Vdc / 12 Amp Solid State Relay

Operating Voltage

1 - 100Vdc

Load Current

.001 - 12 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D1D20 (MOSFET Output)

100Vdc / 20 Amp Solid State Relay

Operating Voltage

1 - 100Vdc

Load Current

.001 - 20 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D1D40 (MOSFET Output)

100Vdc / 40 Amp Solid State Relay

Operating Voltage

1 - 100Vdc

Load Current

.001 - 40 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D2D12 (MOSFET Output)

200Vdc / 12 Amp Solid State Relay

Operating Voltage

1 - 200Vdc

Load Current

.001 - 12 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### D4D12 (MOSFET Output)

400Vdc / 12 Amp Solid State Relay

Operating Voltage

1 - 400Vdc

Load Current

.001 - 12 Amps

Input Voltage

3.5 - 32Vdc

#### AC Output

#### DC60S7 (BJT Output)

60Vdc / 7 Amp Solid State Relay

Operating Voltage

1 - 60Vdc

Load Current

.02 - 7 Amps

Input Voltage

3.5 - 32Vdc

#### Proportional Output Solid State Relays

#### Selectable Analog Input: 0-5V, 0-10V, 4-20mA

#### AC Output

#### PMP2425WP

240Vac / 25 Amp Solid State Relay

Operating Voltage

90 - 280Vac

Load Current

.15 - 25 Amps

Input Voltage

0-5, 0-10, 4-20mA

#### AC Output

#### PMP2450WP

240Vac / 50 Amp Solid State Relay

Operating Voltage

90 - 280Vac

Load Current

.15 - 50 Amps

Input Voltage

0-5, 0-10, 4-20mA

#### AC Output

#### PMP2490WP

240Vac / 90 Amp Solid State Relay

Operating Voltage

90 - 280Vac

Load Current

.15 - 90 Amps

Input Voltage

0-5, 0-10, 4-20mA

#### AC Output

#### PMP4850WP

480Vac / 50 Amp Solid State Relay

Operating Voltage

345 - 530Vac

Load Current

.15 - 50 Amps

Input Voltage

0-5, 0-10, 4-20mA

#### AC Output

#### PMP4890WP

480Vac / 90 Amp Solid State Relay

Operating Voltage

345 - 530Vac

Load Current

.15 - 90 Amps

Input Voltage

0-5, 0-10, 4-20mA

#### AC Output

#### PMP6090WP

600Vac / 90 Amp Solid State Relay

Operating Voltage

420 - 600Vac

Load Current

.15 - 90 Amps

Input Voltage

0-5, 0-10, 4-20mA

## Frequently asked questions

### What is a solid-state relay?

A solid-state relay is basically an electronic switch or relay, but without any moving parts. They perform the same basic function – switch power to / from an electrical load – but do so in a completely different manner. Switches and electromechanical relays contain mechanical contacts that change state (open or close) when a button is pushed, an actuator toggled or, in the case of electromechanical relays and contactors, a voltage is applied to their coil. Crydom solid state relays utilize semiconductors to perform the switching function, which eliminates arcing, mechanical wear and acoustical noise.

### Why do solid-state relays require a heat sink?

The output semiconductors of solid state relays are not perfect switches. The SCRs of AC solid-state relays have a forward voltage drop of about 1Vrms during normal conduction, which means that they generate heat at a rate of about 1 Watt per ampere of load current. This isn’t an issue for load currents below 7 or 8 amps since the base plate of the solid-state relay will effectively transfer some of that heat into the surrounding ambient air. However, once the output current exceeds 8 amps, the base plate can no longer efficiently transfer the heat generated. This can result in excessive internal temperatures that can degrade the life-expectancy of the solid-state relay and lead to premature failure.

An external heat sink is basically an extension of the solid-state relay’s base plate. Heat generated by the SCRs is transferred through the base plate and into the heat sink, which is subsequently cooled by the surrounding ambient air. How well the heat sink transfers this heat is dependent upon its thermal impedance rating, typically expressed in °C per Watt (°C/W). If a solid state relay is mounted to a 1°C/W heat sink, then the temperature of the relay’s base plate will increase at a rate of about 1°C for every ampere of load current that it’s switching. As the efficiency of the heat sink increases, the °C/W rating decreases. A heat sink that’s 30% more efficient than the 1°C/W heat sink referenced above would have a 0.7°C/W rating, for example, which means that the base plate temperature of the solid-state relay would be 30% less at the same load current.

### Why does the load-current rating of a solid-state relay change when mounted to a heat sink?

The specified load-current rating of a solid state relay is dependent upon several factors, including the size of the SCR die in the output circuit, the lead-frame design, wire-termination capacity, and other various design parameters. However, the actual load-current rating of a solid state relay is dependent upon the efficiency of the heat sink to which it’s mounted. Solid state relays generate heat at a rate of about 1 Watt per ampere of load current. This heat must be transferred away from the internal SCRs, through the relay’s base plate and into the surrounding ambient air to prevent it from overheating. Mounting a solid state relay to a heat sink increases its ability to transfer this heat, and how efficiently the heat sink transfers the heat determines how much current the solid state relay can continuously carry.

A common mistake made by many engineers around the world is to use solid-state relays with higher current ratings whenever there’s an issue with the temperature of a solid-state relay with a lower current rating. For example, a Crydom 50 amp solid state relay generates heat at a rate of 1 Watt per amp and is rated to 50 amps when mounted on a 1°C/W heat sink. A Crydom 125 amp solid state relay also generates power at a rate of 1 Watt per amp, which means that its maximum allowable current rating when mounted to the same 1°C/W heat sink is also approximately 50 amps. The internal temperature of the 125 amp solid state relay will be slightly cooler due to the efficiency of it’s design, but not enough to provide a significant increase in the actual current rating. In order to carry more than 50 amps, a larger, more efficient heat sink (or forced airflow) is required.

### What are the benefits to using solid-state relays instead of electromechanical relays, contactors and mercury displacement relays?

Advantages;

· Life expectancy – Solid-state relays can operate reliably for decades in most applications. Theoretically they can operate reliably for centuries but, since the first solid-state relay was invented in 1972, that theory has yet to be proven. However, there are Crydom solid state relays that have been in the field since the 70s that are still operating normally and reliably.

· Silent operation – Solid-state relays do not generate acoustical noise when switching power to/from the load since they contain no moving parts. Therefore, they are the preferred solution in many commercial or residential applications where acoustical noise can quickly become an annoyance.

· Shock & vibration resistance – Since solid-state relays have no moving parts, they are not prone to false triggering under load in harsh environments subject to shock and vibration.

· Fast operation – Instantaneous turn-on solid state relays can switch power to a load in less than 100 microseconds of receiving an input signal. This makes them ideal for phase-angle control applications where tight control over power to the load is required.

· PLC compatibility – As opposed to large contactors or other mechanical relays, solid-state relays can switch heavy loads with only a few milliamps of input current.

· Environmentally friendly – Crydom solid-state relays contain no mercury. Also, the abbreviated life expectancy of electromechanical relays means that hundreds, if not thousands of EMRs will fail and have to be disposed before a single end-of-life solid-state relay failure.

Disadvantages;

· Initial Cost – The initial purchase price of a solid-state relay may be seen as prohibitive in some applications. However, due to the limited life of EMRs, the total cost of ownership of a solid-state relay (the impact on cost over the life of the product in which it is used) is often significantly less than an equivalent rated EMR.

· Size – All solid-state relays dissipate power in the form of heat during normal operation and therefore require an external heat sink in order to operate reliably.

· Galvanic isolation – Some applications require the load to be physically disconnected from the AC mains when in the off state. In these cases, the addition of a series electromechanical relay to provide off-state galvanic isolation might be the only viable solution. Energizing the EMR first in the sequence places the burden of switching full-load current on the solid-state relay and significantly reduces, or eliminates altogether the arcing of the EMR contacts, as does removing the input to the solid-state relay just prior to de-energizing the EMR when switching to the off state.

### What switching technology do solid-state relays utilize?

HBControls primarily uses Crydom AC solid-state relays with inverse-parallel SCRs in their output circuit. Many low-cost solid state relay manufacturers utilize triacs in the output of their relays in order to reduce cost and simplify the manufacturing process. However, triac-output solid state relays have a higher forward-voltage drop than SCR output solid state relays, which means they generate significantly more heat at a given load-current. Triac-output solid state relays also transfer heat through the base-plate less efficiently and, therefore, require larger or more efficient heat sinks than an SCR-based solid state relay.

Solid-state DC relays use low-impedance MOSFETs in their output circuit. However, a limited range of economical bipolar transistor output solid state relays are also available.

### What’s the difference between zero-crossing and instantaneous (random turn-on) solid-state relays?

“Zero crossing” refers to the point in the AC sine wave at which the solid-state relay begins to conduct load current after the input signal applied. If an input signal is applied when the AC sine wave is close to its peak (outside of its “zero-crossing window”), the solid-state relay will not turn-on until it reaches the zero-crossing point. The zero-crossing function gives solid state relays a significant advantage over electromechanical relays and contactors in applications with loads that have a low initial resistance. Since the output of the SSR will not turn on until the sine wave is close to zero, inrush currents are kept to a minimu