Experience Counts
Years of design and manufacturing experience are incorporated into the PA640 making it the most desired siren. Advanced electronics are built into this affordable and compact siren package. PA640 sirens provide 100-watt output and meet Class A and SAE J1849 requirements for sound when paired with any Federal Signal high output speaker.
Built to last
This compact siren (6.8"W x 3"H x 7.75"D) is packed with standard features, built-in versatility and product reliability that simply can’t be matched by similar competitive products. Nine on-board relays are used to deliver 80 amperes of total switching capacity and can control primary, secondary, take down, alley, and auxiliary lighting circuits. The PA640 siren has two built-in flasher circuits available, provides advanced short circuit protection and allows the installer to easily change switch functions via internal programming.
Fully featured
Wail, Yelp, Priority or Hi-Lo, Manual Peak-and-Hold, and Air Horn, are all standard tones and can be enabled by a heavy-duty five position rotary switch. There are six backlit rubber membrane auxiliary relay push button switches, a user-friendly four position high current slide switch, separate push buttons for Air Horn and Manual activation, and a rotary PA/Volume control knob – all smartly located on the face-plate.
Park-Siren Deactivation is built into the PA640 PC board. It is automatically activated once the vehicle transmission is shifted into Park. The Horn Ring Transfer (HRT) function allows siren and light step-through control and delivers effective traffic management, using the steering wheel horn ring.
Complete package
Every siren comes with its own mounting bracket, hard-wired microphone and is electronically short circuit and reverse polarity protected. The PA640 can operate from any 12-volt negative ground electrical system and be powered through a Federal Signal Power Distribution Center or directly from the vehicle’s battery.
Unmatched versatility is achieved through internal programming built into the PA640 siren. Any of the six auxiliary push buttons can be changed from a standard on/off switch into a momentary, flasher, or eight second timer.
In addition, auxiliary relays, standard tones and even HRT functions can be programmed to operate off of any slide switch position desired.
Advanced electronic technology that features the use of crystal-controlled microprocessors dramatically enhances the reliability of the PA640 siren. This type of microprocessor continuously monitors current flow between the output transistors and the speaker. This “dynamic” style of short circuit protection between the output transistors and the amplifier delivers a quicker, more effective way to protect your siren warning system.


Approvals SAE J1849 / July -02 compliant and CCR (CAC) Title 13 Class A
Voltage 11 VDC to 16 VDC
Standby Current 0mA (ignition off), 150mA (ignition on)
Operating Current 9.25A (@ 13.6V with 11-ohm load, amplifier in wail)
Operating Temperature Range -30˚ C to +65˚ C
Output 64V peak-to-peak
Total Current Rating for Relay 80A Combined Total – all relays
Slide Switch Outputs Mode 1 (30A), Mode 2 (30A) and Mode 3 (30A), (40A combined total)
Push-button Switch Outputs 20A each
Dim. (W x L x D) 6.8 in x 3.0 in x 7.8 in (17.3 cm x 7.6 cm x 19.7 cm)
Shipping Weight 6 lb


Audible Equipment may produce LOUD sounds necessary to request the right-of-way. Audible equipment may cause hearing damage. Wear hearing protection. Refer to the Installation Manual or call 800/433-9132 for further instructions.

Important Warning for Police Boats and Fire Rescue Boats

It has come to our attention that police boat and fire rescue boat sirens and speakers may subject persons operating those craft to sound pressure levels that can cause permanent hearing loss. We recommend that speakers be located as far forward on the boat as possible, as recommended in the SAE Recommended Practice J1849 "Emergency Vehicle Sirens". However, unprotected exposures of a sufficient duration to properly located siren speakers can still create a risk of hearing loss.

It is our recommendation that your siren speakers should be relocated and persons operating these craft should wear hearing protection when using the siren system.

Failure to comply with these recommendations may result in temporary or permanent hearing loss to operators and passengers of these vehicles.


Program a PA640 siren

Ordering Information

Model Types
Model Description
640000 Siren, 100-watt, light control, 80-amp switch capacity, internally programmable, standard tones and HRT (Horn Ring Transfer)
Replacement Parts
Description Part Number
KNOB Z141A102
KNOB Z8536C1041A